64978252 has 24 divisors (see below), whose sum is σ = 122250240. Its totient is φ = 30122640.

The previous prime is 64978247. The next prime is 64978259. The reversal of 64978252 is 25287946.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 64978199 and 64978208.

It is not an unprimeable number, because it can be changed into a prime (64978259) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5524 + ... + 12667.

It is an arithmetic number, because the mean of its divisors is an integer number (5093760).

Almost surely, 2^64978252 is an apocalyptic number.

It is an amenable number.

64978252 is a deficient number, since it is larger than the sum of its proper divisors (57271988).

64978252 is a wasteful number, since it uses less digits than its factorization.

64978252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18261 (or 18259 counting only the distinct ones).

The product of its digits is 241920, while the sum is 43.

The square root of 64978252 is about 8060.9088817577. The cubic root of 64978252 is about 402.0277284241.

The spelling of 64978252 in words is "sixty-four million, nine hundred seventy-eight thousand, two hundred fifty-two".