64680872 has 8 divisors (see below), whose sum is σ = 121276650. Its totient is φ = 32340432.

The previous prime is 64680871. The next prime is 64680877. The reversal of 64680872 is 27808646.

It can be written as a sum of positive squares in only one way, i.e., 64416676 + 264196 = 8026^2 + 514^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (64680871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4042547 + ... + 4042562.

Almost surely, 2^64680872 is an apocalyptic number.

It is an amenable number.

64680872 is a deficient number, since it is larger than the sum of its proper divisors (56595778).

64680872 is a wasteful number, since it uses less digits than its factorization.

64680872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8085115 (or 8085111 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 64680872 is about 8042.4419177262. The cubic root of 64680872 is about 401.4134826171.

It can be divided in two parts, 646 and 80872, that added together give a palindrome (81518).

The spelling of 64680872 in words is "sixty-four million, six hundred eighty thousand, eight hundred seventy-two".