157923720 has 96 divisors (see below), whose sum is σ = 518356800. Its totient is φ = 41694336.

The previous prime is 157923697. The next prime is 157923721. The reversal of 157923720 is 27329751.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (157923721) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 34951 + ... + 39209.

It is an arithmetic number, because the mean of its divisors is an integer number (5399550).

Almost surely, 2^157923720 is an apocalyptic number.

157923720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 157923720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259178400).

157923720 is an abundant number, since it is smaller than the sum of its proper divisors (360433080).

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

157923720 is a wasteful number, since it uses less digits than its factorization.

157923720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4379 (or 4372 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 157923720 is about 12566.7704681831. The cubic root of 157923720 is about 540.5250038138.

The spelling of 157923720 in words is "one hundred fifty-seven million, nine hundred twenty-three thousand, seven hundred twenty".