64691474 has 4 divisors (see below), whose sum is σ = 97037214. Its totient is φ = 32345736.

The previous prime is 64691467. The next prime is 64691507. The reversal of 64691474 is 47419646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 63091249 + 1600225 = 7943^2 + 1265^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16172867 + ... + 16172870.

Almost surely, 2^64691474 is an apocalyptic number.

64691474 is a deficient number, since it is larger than the sum of its proper divisors (32345740).

64691474 is a wasteful number, since it uses less digits than its factorization.

64691474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32345739.

The product of its digits is 145152, while the sum is 41.

The square root of 64691474 is about 8043.1010188857. The cubic root of 64691474 is about 401.4354136410.

The spelling of 64691474 in words is "sixty-four million, six hundred ninety-one thousand, four hundred seventy-four".