78631632 has 30 divisors (see below), whose sum is σ = 220059762. Its totient is φ = 26210496.

The previous prime is 78631591. The next prime is 78631639. The reversal of 78631632 is 23613687.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 39992976 + 38638656 = 6324^2 + 6216^2 .

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 (78631639) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 272883 + ... + 273170.

Almost surely, 2^78631632 is an apocalyptic number.

78631632 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78631632 is an abundant number, since it is smaller than the sum of its proper divisors (141428130).

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

78631632 is a wasteful number, since it uses less digits than its factorization.

78631632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546067 (or 546058 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 78631632 is about 8867.4478853839. The cubic root of 78631632 is about 428.4160800771.

The spelling of 78631632 in words is "seventy-eight million, six hundred thirty-one thousand, six hundred thirty-two".