64618978 has 8 divisors (see below), whose sum is σ = 98757468. Its totient is φ = 31699824.

The previous prime is 64618951. The next prime is 64618979. The reversal of 64618978 is 87981646.

It can be written as a sum of positive squares in 2 ways, for example, as 62299449 + 2319529 = 7893^2 + 1523^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×64618978² = 8351224635528968, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (64618979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 304701 + ... + 304912.

Almost surely, 2^64618978 is an apocalyptic number.

64618978 is a deficient number, since it is larger than the sum of its proper divisors (34138490).

64618978 is a wasteful number, since it uses less digits than its factorization.

64618978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 609668.

The product of its digits is 580608, while the sum is 49.

The square root of 64618978 is about 8038.5930360978. The cubic root of 64618978 is about 401.2854024269.

The spelling of 64618978 in words is "sixty-four million, six hundred eighteen thousand, nine hundred seventy-eight".