157720 has 16 divisors (see below), whose sum is σ = 354960. Its totient is φ = 63072.

The previous prime is 157679. The next prime is 157721. The reversal of 157720 is 27751.

It is a nialpdrome in base 11.

It is a junction number, because it is equal to n+sod(n) for n = 157691 and 157700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (157721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1932 + ... + 2011.

It is an arithmetic number, because the mean of its divisors is an integer number (22185).

2¹⁵⁷⁷²⁰ is an apocalyptic number.

157720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

157720 is an abundant number, since it is smaller than the sum of its proper divisors (197240).

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

157720 is a wasteful number, since it uses less digits than its factorization.

157720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3954 (or 3950 counting only the distinct ones).

The product of its (nonzero) digits is 490, while the sum is 22.

The square root of 157720 is about 397.1397738832. The cubic root of 157720 is about 54.0292479873.

The spelling of 157720 in words is "one hundred fifty-seven thousand, seven hundred twenty".