61508664 has 48 divisors (see below), whose sum is σ = 190385520. Its totient is φ = 17573760.

The previous prime is 61508663. The next prime is 61508677. The reversal of 61508664 is 46680516.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61508663) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 60517 + ... + 61524.

It is an arithmetic number, because the mean of its divisors is an integer number (3966365).

Almost surely, 2^61508664 is an apocalyptic number.

It is an amenable number.

61508664 is an abundant number, since it is smaller than the sum of its proper divisors (128876856).

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

61508664 is a wasteful number, since it uses less digits than its factorization.

61508664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122060 (or 122053 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 61508664 is about 7842.7459476895. The cubic root of 61508664 is about 394.7408736823.

The spelling of 61508664 in words is "sixty-one million, five hundred eight thousand, six hundred sixty-four".