157664720 has 20 divisors (see below), whose sum is σ = 366570660. Its totient is φ = 63065856.

The previous prime is 157664713. The next prime is 157664753. The reversal of 157664720 is 27466751.

It can be written as a sum of positive squares in 2 ways, for example, as 92313664 + 65351056 = 9608^2 + 8084^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

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 3 ways as a sum of consecutive naturals, for example, 985325 + ... + 985484.

It is an arithmetic number, because the mean of its divisors is an integer number (18328533).

Almost surely, 2^157664720 is an apocalyptic number.

157664720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157664720 is an abundant number, since it is smaller than the sum of its proper divisors (208905940).

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

157664720 is a wasteful number, since it uses less digits than its factorization.

157664720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1970822 (or 1970816 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 38.

The square root of 157664720 is about 12556.4612849322. The cubic root of 157664720 is about 540.2293493074.

The spelling of 157664720 in words is "one hundred fifty-seven million, six hundred sixty-four thousand, seven hundred twenty".