64621641 has 48 divisors (see below), whose sum is σ = 111792960. Its totient is φ = 32901120.

The previous prime is 64621637. The next prime is 64621643. The reversal of 64621641 is 14612646.

It is not a de Polignac number, because 64621641 - 2² = 64621637 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64621599 and 64621608.

It is not an unprimeable number, because it can be changed into a prime (64621643) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 46801 + ... + 48161.

It is an arithmetic number, because the mean of its divisors is an integer number (2329020).

Almost surely, 2^64621641 is an apocalyptic number.

It is an amenable number.

64621641 is a deficient number, since it is larger than the sum of its proper divisors (47171319).

64621641 is a wasteful number, since it uses less digits than its factorization.

64621641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1414 (or 1407 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 64621641 is about 8038.7586728300. The cubic root of 64621641 is about 401.2909147824.

The spelling of 64621641 in words is "sixty-four million, six hundred twenty-one thousand, six hundred forty-one".