61218464 has 24 divisors (see below), whose sum is σ = 120748320. Its totient is φ = 30552256.

The previous prime is 61218431. The next prime is 61218467. The reversal of 61218464 is 46481216.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a self number, because there is not a number n which added to its sum of digits gives 61218464.

It is not an unprimeable number, because it can be changed into a prime (61218467) 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, 19637 + ... + 22539.

It is an arithmetic number, because the mean of its divisors is an integer number (5031180).

Almost surely, 2^61218464 is an apocalyptic number.

It is an amenable number.

61218464 is a deficient number, since it is larger than the sum of its proper divisors (59529856).

61218464 is a wasteful number, since it uses less digits than its factorization.

61218464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3572 (or 3564 counting only the distinct ones).

The product of its digits is 9216, while the sum is 32.

The square root of 61218464 is about 7824.2229007103. Note that the first 3 decimals coincide. The cubic root of 61218464 is about 394.1190944399.

The spelling of 61218464 in words is "sixty-one million, two hundred eighteen thousand, four hundred sixty-four".