64631473 has 4 divisors (see below), whose sum is σ = 65059648. Its totient is φ = 64203300.

The previous prime is 64631471. The next prime is 64631477. The reversal of 64631473 is 37413646.

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 a cyclic number.

It is not a de Polignac number, because 64631473 - 2¹ = 64631471 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64631471) 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, 213861 + ... + 214162.

It is an arithmetic number, because the mean of its divisors is an integer number (16264912).

Almost surely, 2^64631473 is an apocalyptic number.

It is an amenable number.

64631473 is a deficient number, since it is larger than the sum of its proper divisors (428175).

64631473 is a wasteful number, since it uses less digits than its factorization.

64631473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428174.

The product of its digits is 36288, while the sum is 34.

The square root of 64631473 is about 8039.3701867746. The cubic root of 64631473 is about 401.3112655098.

The spelling of 64631473 in words is "sixty-four million, six hundred thirty-one thousand, four hundred seventy-three".