157809620 has 30 divisors (see below), whose sum is σ = 337773282. Its totient is φ = 61932832.

The previous prime is 157809593. The next prime is 157809653. The reversal of 157809620 is 26908751.

It can be written as a sum of positive squares in 5 ways, for example, as 5776 + 157803844 = 76^2 + 12562^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2977514 + ... + 2977566.

Almost surely, 2^157809620 is an apocalyptic number.

157809620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157809620 is an abundant number, since it is smaller than the sum of its proper divisors (179963662).

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

157809620 is an frugal number, since it uses more digits than its factorization.

157809620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221 (or 60 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 157809620 is about 12562.2298975938. The cubic root of 157809620 is about 540.3947958838.

The spelling of 157809620 in words is "one hundred fifty-seven million, eight hundred nine thousand, six hundred twenty".