61664480 has 24 divisors (see below), whose sum is σ = 145682712. Its totient is φ = 24665728.

The previous prime is 61664467. The next prime is 61664497. The reversal of 61664480 is 8446616.

It is a self number, because there is not a number n which added to its sum of digits gives 61664480.

It is a congruent number.

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, 192542 + ... + 192861.

It is an arithmetic number, because the mean of its divisors is an integer number (6070113).

Almost surely, 2^61664480 is an apocalyptic number.

It is an amenable number.

61664480 is an abundant number, since it is smaller than the sum of its proper divisors (84018232).

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

61664480 is a wasteful number, since it uses less digits than its factorization.

61664480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385418 (or 385410 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 35.

The square root of 61664480 is about 7852.6734301128. The cubic root of 61664480 is about 395.0739166269.

The spelling of 61664480 in words is "sixty-one million, six hundred sixty-four thousand, four hundred eighty".