157991288 has 128 divisors (see below), whose sum is σ = 384384000. Its totient is φ = 60455808.

The previous prime is 157991279. The next prime is 157991297. The reversal of 157991288 is 882199751.

It is an interprime number because it is at equal distance from previous prime (157991279) and next prime (157991297).

It is a super-2 number, since 2×157991288² = 49922494167797888, which contains 22 as substring.

Its product of digits (362880) is a multiple of the sum of its prime divisors (168).

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 31 ways as a sum of consecutive naturals, for example, 1533845 + ... + 1533947.

It is an arithmetic number, because the mean of its divisors is an integer number (3003000).

Almost surely, 2^157991288 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 157991288, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192192000).

157991288 is an abundant number, since it is smaller than the sum of its proper divisors (226392712).

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

157991288 is a wasteful number, since it uses less digits than its factorization.

157991288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 186 (or 168 counting only the distinct ones).

The product of its digits is 362880, while the sum is 50.

The square root of 157991288 is about 12569.4585404464. The cubic root of 157991288 is about 540.6020810804.

The spelling of 157991288 in words is "one hundred fifty-seven million, nine hundred ninety-one thousand, two hundred eighty-eight".