61678636 has 12 divisors (see below), whose sum is σ = 113618680. Its totient is φ = 29216160.

The previous prime is 61678627. The next prime is 61678651. The reversal of 61678636 is 63687616.

It is a junction number, because it is equal to n+sod(n) for n = 61678592 and 61678601.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405705 + ... + 405856.

Almost surely, 2^61678636 is an apocalyptic number.

It is an amenable number.

61678636 is a deficient number, since it is larger than the sum of its proper divisors (51940044).

61678636 is a wasteful number, since it uses less digits than its factorization.

61678636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811584 (or 811582 counting only the distinct ones).

The product of its digits is 217728, while the sum is 43.

The square root of 61678636 is about 7853.5747274728. The cubic root of 61678636 is about 395.1041460148.

The spelling of 61678636 in words is "sixty-one million, six hundred seventy-eight thousand, six hundred thirty-six".