78531616 has 12 divisors (see below), whose sum is σ = 154609182. Its totient is φ = 39265792.

The previous prime is 78531613. The next prime is 78531643. The reversal of 78531616 is 61613587.

It can be written as a sum of positive squares in only one way, i.e., 69555600 + 8976016 = 8340^2 + 2996^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78531613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1227025 + ... + 1227088.

Almost surely, 2^78531616 is an apocalyptic number.

It is an amenable number.

78531616 is a deficient number, since it is larger than the sum of its proper divisors (76077566).

78531616 is a wasteful number, since it uses less digits than its factorization.

78531616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2454123 (or 2454115 counting only the distinct ones).

The product of its digits is 30240, while the sum is 37.

The square root of 78531616 is about 8861.8065878240. The cubic root of 78531616 is about 428.2343608311.

The spelling of 78531616 in words is "seventy-eight million, five hundred thirty-one thousand, six hundred sixteen".