64690473 has 4 divisors (see below), whose sum is σ = 86253968. Its totient is φ = 43126980.

The previous prime is 64690463. The next prime is 64690477. The reversal of 64690473 is 37409646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64690473 - 2⁸ = 64690217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (64690477) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10781743 + ... + 10781748.

It is an arithmetic number, because the mean of its divisors is an integer number (21563492).

Almost surely, 2^64690473 is an apocalyptic number.

It is an amenable number.

64690473 is a deficient number, since it is larger than the sum of its proper divisors (21563495).

64690473 is a wasteful number, since it uses less digits than its factorization.

64690473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21563494.

The product of its (nonzero) digits is 108864, while the sum is 39.

The square root of 64690473 is about 8043.0387914022. The cubic root of 64690473 is about 401.4333431006.

It can be divided in two parts, 646 and 90473, that added together give a palindrome (91119).

The spelling of 64690473 in words is "sixty-four million, six hundred ninety thousand, four hundred seventy-three".