61664688 has 30 divisors (see below), whose sum is σ = 172575884. Its totient is φ = 20554848.

The previous prime is 61664683. The next prime is 61664689. The reversal of 61664688 is 88646616.

It is a super-2 number, since 2×61664688² = 7605067492274688, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (61664683) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213970 + ... + 214257.

Almost surely, 2^61664688 is an apocalyptic number.

It is an amenable number.

61664688 is an abundant number, since it is smaller than the sum of its proper divisors (110911196).

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

61664688 is a wasteful number, since it uses less digits than its factorization.

61664688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428241 (or 428232 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 61664688 is about 7852.6866739989. The cubic root of 61664688 is about 395.0743608334.

The spelling of 61664688 in words is "sixty-one million, six hundred sixty-four thousand, six hundred eighty-eight".