64628637 has 4 divisors (see below), whose sum is σ = 86171520. Its totient is φ = 43085756.

The previous prime is 64628623. The next prime is 64628647. The reversal of 64628637 is 73682646.

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 64628637 - 2⁴ = 64628621 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64628647) 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, 10771437 + ... + 10771442.

It is an arithmetic number, because the mean of its divisors is an integer number (21542880).

Almost surely, 2^64628637 is an apocalyptic number.

It is an amenable number.

64628637 is a deficient number, since it is larger than the sum of its proper divisors (21542883).

64628637 is a wasteful number, since it uses less digits than its factorization.

64628637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21542882.

The product of its digits is 290304, while the sum is 42.

The square root of 64628637 is about 8039.1938028636. The cubic root of 64628637 is about 401.3053956379.

The spelling of 64628637 in words is "sixty-four million, six hundred twenty-eight thousand, six hundred thirty-seven".