64781874 has 24 divisors (see below), whose sum is σ = 141080940. Its totient is φ = 21483168.

The previous prime is 64781851. The next prime is 64781881. The reversal of 64781874 is 47818746.

It can be written as a sum of positive squares in 2 ways, for example, as 53187849 + 11594025 = 7293^2 + 3405^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5589 + ... + 12680.

Almost surely, 2^64781874 is an apocalyptic number.

64781874 is an abundant number, since it is smaller than the sum of its proper divisors (76299066).

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

64781874 is a wasteful number, since it uses less digits than its factorization.

64781874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18474 (or 18471 counting only the distinct ones).

The product of its digits is 301056, while the sum is 45.

The square root of 64781874 is about 8048.7187800295. The cubic root of 64781874 is about 401.6223155023.

The spelling of 64781874 in words is "sixty-four million, seven hundred eighty-one thousand, eight hundred seventy-four".