64978090 has 8 divisors (see below), whose sum is σ = 116960580. Its totient is φ = 25991232.

The previous prime is 64978079. The next prime is 64978129. The reversal of 64978090 is 9087946.

It can be written as a sum of positive squares in 2 ways, for example, as 63792169 + 1185921 = 7987^2 + 1089^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3248895 + ... + 3248914.

Almost surely, 2^64978090 is an apocalyptic number.

64978090 is a deficient number, since it is larger than the sum of its proper divisors (51982490).

64978090 is a wasteful number, since it uses less digits than its factorization.

64978090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6497816.

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 64978090 is about 8060.8988332567. The cubic root of 64978090 is about 402.0273943197.

The spelling of 64978090 in words is "sixty-four million, nine hundred seventy-eight thousand, ninety".