64978089 has 16 divisors (see below), whose sum is σ = 95300544. Its totient is φ = 39378240.

The previous prime is 64978079. The next prime is 64978129. The reversal of 64978089 is 98087946.

It is a happy number.

It is not a de Polignac number, because 64978089 - 2⁸ = 64977833 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64978049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4144 + ... + 12129.

It is an arithmetic number, because the mean of its divisors is an integer number (5956284).

Almost surely, 2^64978089 is an apocalyptic number.

It is an amenable number.

64978089 is a deficient number, since it is larger than the sum of its proper divisors (30322455).

64978089 is a wasteful number, since it uses less digits than its factorization.

64978089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16309 (or 16287 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 64978089 is about 8060.8987712289. The cubic root of 64978089 is about 402.0273922574.

The spelling of 64978089 in words is "sixty-four million, nine hundred seventy-eight thousand, eighty-nine".