61481664 has 42 divisors (see below), whose sum is σ = 176227740. Its totient is φ = 20493696.

The previous prime is 61481659. The next prime is 61481677. The reversal of 61481664 is 46618416.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 52794 + ... + 53945.

Almost surely, 2^61481664 is an apocalyptic number.

61481664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

61481664 is an abundant number, since it is smaller than the sum of its proper divisors (114746076).

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

61481664 is a wasteful number, since it uses less digits than its factorization.

61481664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106757 (or 106744 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 61481664 is about 7841.0244228672. The cubic root of 61481664 is about 394.6831064088.

The spelling of 61481664 in words is "sixty-one million, four hundred eighty-one thousand, six hundred sixty-four".