78327531 has 24 divisors (see below), whose sum is σ = 115128000. Its totient is φ = 51309936.

The previous prime is 78327503. The next prime is 78327541. The reversal of 78327531 is 13572387.

It is not a de Polignac number, because 78327531 - 2⁵ = 78327499 is a prime.

It is a super-2 number, since 2×78327531² = 12270404225111922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78327541) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 156720 + ... + 157218.

It is an arithmetic number, because the mean of its divisors is an integer number (4797000).

Almost surely, 2^78327531 is an apocalyptic number.

78327531 is a deficient number, since it is larger than the sum of its proper divisors (36800469).

78327531 is a wasteful number, since it uses less digits than its factorization.

78327531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775 (or 772 counting only the distinct ones).

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

The square root of 78327531 is about 8850.2842327238. The cubic root of 78327531 is about 427.8630792556.

The spelling of 78327531 in words is "seventy-eight million, three hundred twenty-seven thousand, five hundred thirty-one".