78157332 has 48 divisors (see below), whose sum is σ = 221054400. Its totient is φ = 23683680.

The previous prime is 78157319. The next prime is 78157333. The reversal of 78157332 is 23375187.

78157332 is a `hidden beast` number, since 7 + 81 + 573 + 3 + 2 = 666.

It is a super-2 number, since 2×78157332² = 12217137090716448, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78157333) 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, 31707 + ... + 34082.

It is an arithmetic number, because the mean of its divisors is an integer number (4605300).

Almost surely, 2^78157332 is an apocalyptic number.

It is an amenable number.

78157332 is an abundant number, since it is smaller than the sum of its proper divisors (142897068).

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

78157332 is a wasteful number, since it uses less digits than its factorization.

78157332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65813 (or 65805 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 78157332 is about 8840.6635497569. The cubic root of 78157332 is about 427.5529512742.

The spelling of 78157332 in words is "seventy-eight million, one hundred fifty-seven thousand, three hundred thirty-two".