64624021 has 16 divisors (see below), whose sum is σ = 85311360. Its totient is φ = 47393280.

The previous prime is 64624009. The next prime is 64624031. The reversal of 64624021 is 12042646.

It is not a de Polignac number, because 64624021 - 2⁵ = 64623989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64624031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23376 + ... + 25993.

It is an arithmetic number, because the mean of its divisors is an integer number (5331960).

Almost surely, 2^64624021 is an apocalyptic number.

It is an amenable number.

64624021 is a deficient number, since it is larger than the sum of its proper divisors (20687339).

64624021 is a wasteful number, since it uses less digits than its factorization.

64624021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49404.

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 64624021 is about 8038.9067042727. The cubic root of 64624021 is about 401.2958412056.

Adding to 64624021 its reverse (12042646), we get a palindrome (76666667).

The spelling of 64624021 in words is "sixty-four million, six hundred twenty-four thousand, twenty-one".