64889992 has 32 divisors (see below), whose sum is σ = 128724480. Its totient is φ = 30602880.

The previous prime is 64889983. The next prime is 64890011. The reversal of 64889992 is 29998846.

It is a super-2 number, since 2×64889992² = 8421422123520128, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11017 + ... + 15847.

It is an arithmetic number, because the mean of its divisors is an integer number (4022640).

Almost surely, 2^64889992 is an apocalyptic number.

It is an amenable number.

64889992 is a deficient number, since it is larger than the sum of its proper divisors (63834488).

64889992 is a wasteful number, since it uses less digits than its factorization.

64889992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4933 (or 4929 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 55.

The square root of 64889992 is about 8055.4324526992. The cubic root of 64889992 is about 401.8456211094.

The spelling of 64889992 in words is "sixty-four million, eight hundred eighty-nine thousand, nine hundred ninety-two".