155564720 has 40 divisors (see below), whose sum is σ = 365434944. Its totient is φ = 61581312.

The previous prime is 155564707. The next prime is 155564737. The reversal of 155564720 is 27465551.

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

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, 2264 + ... + 17783.

Almost surely, 2^155564720 is an apocalyptic number.

155564720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155564720 is an abundant number, since it is smaller than the sum of its proper divisors (209870224).

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

155564720 is a wasteful number, since it uses less digits than its factorization.

155564720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20157 (or 20151 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 35.

The square root of 155564720 is about 12472.5586789560. The cubic root of 155564720 is about 537.8201100226.

The spelling of 155564720 in words is "one hundred fifty-five million, five hundred sixty-four thousand, seven hundred twenty".