155215772 has 24 divisors (see below), whose sum is σ = 282752400. Its totient is φ = 74462976.

The previous prime is 155215771. The next prime is 155215787. The reversal of 155215772 is 277512551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155215771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14804 + ... + 23012.

It is an arithmetic number, because the mean of its divisors is an integer number (11781350).

Almost surely, 2^155215772 is an apocalyptic number.

It is an amenable number.

155215772 is a deficient number, since it is larger than the sum of its proper divisors (127536628).

155215772 is a wasteful number, since it uses less digits than its factorization.

155215772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8405 (or 8403 counting only the distinct ones).

The product of its digits is 24500, while the sum is 35.

The square root of 155215772 is about 12458.5621963371. The cubic root of 155215772 is about 537.4176799836.

The spelling of 155215772 in words is "one hundred fifty-five million, two hundred fifteen thousand, seven hundred seventy-two".