78081732 has 42 divisors (see below), whose sum is σ = 204878478. Its totient is φ = 26026272.

The previous prime is 78081719. The next prime is 78081737. The reversal of 78081732 is 23718087.

It can be written as a sum of positive squares in only one way, i.e., 53934336 + 24147396 = 7344^2 + 4914^2 .

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 (78081737) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 10473 + ... + 16304.

It is an arithmetic number, because the mean of its divisors is an integer number (4878059).

Almost surely, 2^78081732 is an apocalyptic number.

It is an amenable number.

78081732 is an abundant number, since it is smaller than the sum of its proper divisors (126796746).

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

78081732 is a wasteful number, since it uses less digits than its factorization.

78081732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26799 (or 26782 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 78081732 is about 8836.3868181514. The cubic root of 78081732 is about 427.4150523734.

The spelling of 78081732 in words is "seventy-eight million, eighty-one thousand, seven hundred thirty-two".