64870971 has 16 divisors (see below), whose sum is σ = 98461440. Its totient is φ = 37605920.

The previous prime is 64870969. The next prime is 64871011. The reversal of 64870971 is 17907846.

It is not a de Polignac number, because 64870971 - 2¹ = 64870969 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (64870931) 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, 41976 + ... + 43493.

It is an arithmetic number, because the mean of its divisors is an integer number (6153840).

Almost surely, 2^64870971 is an apocalyptic number.

64870971 is a deficient number, since it is larger than the sum of its proper divisors (33590469).

64870971 is a wasteful number, since it uses less digits than its factorization.

64870971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85506.

The product of its (nonzero) digits is 84672, while the sum is 42.

The square root of 64870971 is about 8054.2517343326. The cubic root of 64870971 is about 401.8063533564.

The spelling of 64870971 in words is "sixty-four million, eight hundred seventy thousand, nine hundred seventy-one".