61686732 has 12 divisors (see below), whose sum is σ = 143935736. Its totient is φ = 20562240.

The previous prime is 61686731. The next prime is 61686767. The reversal of 61686732 is 23768616.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (61686731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2570269 + ... + 2570292.

Almost surely, 2^61686732 is an apocalyptic number.

It is an amenable number.

61686732 is an abundant number, since it is smaller than the sum of its proper divisors (82249004).

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

61686732 is a wasteful number, since it uses less digits than its factorization.

61686732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5140568 (or 5140566 counting only the distinct ones).

The product of its digits is 72576, while the sum is 39.

The square root of 61686732 is about 7854.0901446316. The cubic root of 61686732 is about 395.1214325148.

The spelling of 61686732 in words is "sixty-one million, six hundred eighty-six thousand, seven hundred thirty-two".