155772840 has 64 divisors (see below), whose sum is σ = 469229760. Its totient is φ = 41369600.

The previous prime is 155772839. The next prime is 155772857. The reversal of 155772840 is 48277551.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

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 15 ways as a sum of consecutive naturals, for example, 28315 + ... + 33365.

It is an arithmetic number, because the mean of its divisors is an integer number (7331715).

Almost surely, 2^155772840 is an apocalyptic number.

155772840 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 155772840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (234614880).

155772840 is an abundant number, since it is smaller than the sum of its proper divisors (313456920).

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

155772840 is a wasteful number, since it uses less digits than its factorization.

155772840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5322 (or 5318 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 39.

The square root of 155772840 is about 12480.8990060813. The cubic root of 155772840 is about 538.0598414202.

The spelling of 155772840 in words is "one hundred fifty-five million, seven hundred seventy-two thousand, eight hundred forty".