155915864 has 64 divisors (see below), whose sum is σ = 328285440. Its totient is φ = 68935680.

The previous prime is 155915849. The next prime is 155915867. The reversal of 155915864 is 468519551.

Its product of digits (216000) is a multiple of the sum of its prime factors (540).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155915867) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 441512 + ... + 441864.

It is an arithmetic number, because the mean of its divisors is an integer number (5129460).

Almost surely, 2^155915864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155915864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164142720).

155915864 is an abundant number, since it is smaller than the sum of its proper divisors (172369576).

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

155915864 is a wasteful number, since it uses less digits than its factorization.

155915864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540 (or 536 counting only the distinct ones).

The product of its digits is 216000, while the sum is 44.

The square root of 155915864 is about 12486.6274069502. The cubic root of 155915864 is about 538.2244656049.

The spelling of 155915864 in words is "one hundred fifty-five million, nine hundred fifteen thousand, eight hundred sixty-four".