157790640 has 80 divisors (see below), whose sum is σ = 559035648. Its totient is φ = 36066048.

The previous prime is 157790627. The next prime is 157790641. The reversal of 157790640 is 46097751.

157790640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (157790641) 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, 45282 + ... + 48641.

Almost surely, 2^157790640 is an apocalyptic number.

157790640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157790640 is an abundant number, since it is smaller than the sum of its proper divisors (401245008).

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

157790640 is a wasteful number, since it uses less digits than its factorization.

157790640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93946 (or 93940 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 157790640 is about 12561.4744357500. The cubic root of 157790640 is about 540.3731303173.

The spelling of 157790640 in words is "one hundred fifty-seven million, seven hundred ninety thousand, six hundred forty".