155514640 has 80 divisors (see below), whose sum is σ = 392318640. Its totient is φ = 57098240.

The previous prime is 155514629. The next prime is 155514659. The reversal of 155514640 is 46415551.

It can be written as a sum of positive squares in 8 ways, for example, as 3041536 + 152473104 = 1744^2 + 12348^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54366 + ... + 57154.

It is an arithmetic number, because the mean of its divisors is an integer number (4903983).

Almost surely, 2^155514640 is an apocalyptic number.

155514640 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 155514640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196159320).

155514640 is an abundant number, since it is smaller than the sum of its proper divisors (236804000).

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

155514640 is a wasteful number, since it uses less digits than its factorization.

155514640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2860 (or 2854 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

The square root of 155514640 is about 12470.5509100440. The cubic root of 155514640 is about 537.7623914476.

The spelling of 155514640 in words is "one hundred fifty-five million, five hundred fourteen thousand, six hundred forty".