155826640 has 40 divisors (see below), whose sum is σ = 365833728. Its totient is φ = 61722240.

The previous prime is 155826637. The next prime is 155826673. The reversal of 155826640 is 46628551.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 155826640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1216 + ... + 17695.

Almost surely, 2^155826640 is an apocalyptic number.

155826640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155826640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182916864).

155826640 is an abundant number, since it is smaller than the sum of its proper divisors (210007088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

155826640 is a wasteful number, since it uses less digits than its factorization.

155826640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19027 (or 19021 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 37.

The square root of 155826640 is about 12483.0541134772. The cubic root of 155826640 is about 538.1217783781.

It can be divided in two parts, 15582 and 6640, that added together give a palindrome (22222).

The spelling of 155826640 in words is "one hundred fifty-five million, eight hundred twenty-six thousand, six hundred forty".