54640686 has 32 divisors (see below), whose sum is σ = 120745728. Its totient is φ = 16396160.

The previous prime is 54640681. The next prime is 54640687. The reversal of 54640686 is 68604645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (54640681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9300 + ... + 13991.

It is an arithmetic number, because the mean of its divisors is an integer number (3773304).

Almost surely, 2^54640686 is an apocalyptic number.

54640686 is an abundant number, since it is smaller than the sum of its proper divisors (66105042).

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

54640686 is a wasteful number, since it uses less digits than its factorization.

54640686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23336.

The product of its (nonzero) digits is 138240, while the sum is 39.

The square root of 54640686 is about 7391.9338471066. The cubic root of 54640686 is about 379.4652820877.

The spelling of 54640686 in words is "fifty-four million, six hundred forty thousand, six hundred eighty-six".