64978842 has 32 divisors (see below), whose sum is σ = 131984640. Its totient is φ = 21324800.

The previous prime is 64978829. The next prime is 64978867. The reversal of 64978842 is 24887946.

It is a junction number, because it is equal to n+sod(n) for n = 64978791 and 64978800.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 161842 + ... + 162242.

It is an arithmetic number, because the mean of its divisors is an integer number (4124520).

Almost surely, 2^64978842 is an apocalyptic number.

64978842 is an abundant number, since it is smaller than the sum of its proper divisors (67005798).

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

64978842 is a wasteful number, since it uses less digits than its factorization.

64978842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758.

The product of its digits is 774144, while the sum is 48.

The square root of 64978842 is about 8060.9454780441. The cubic root of 64978842 is about 402.0289452191.

The spelling of 64978842 in words is "sixty-four million, nine hundred seventy-eight thousand, eight hundred forty-two".