64719970 has 32 divisors (see below), whose sum is σ = 133757568. Its totient is φ = 22086528.

The previous prime is 64719931. The next prime is 64719973. The reversal of 64719970 is 7991746.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (64719973) 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, 13854 + ... + 17926.

It is an arithmetic number, because the mean of its divisors is an integer number (4179924).

Almost surely, 2^64719970 is an apocalyptic number.

64719970 is an abundant number, since it is smaller than the sum of its proper divisors (69037598).

64719970 is a wasteful number, since it uses less digits than its factorization.

64719970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4314.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 64719970 is about 8044.8722799060. The cubic root of 64719970 is about 401.4943478591.

The spelling of 64719970 in words is "sixty-four million, seven hundred nineteen thousand, nine hundred seventy".