64530621 has 8 divisors (see below), whose sum is σ = 95600960. Its totient is φ = 43020396.

The previous prime is 64530541. The next prime is 64530629. The reversal of 64530621 is 12603546.

64530621 is a `hidden beast` number, since 6 + 4 + 5 + 30 + 621 = 666.

It is not a de Polignac number, because 64530621 - 2⁷ = 64530493 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2390023 = 64530621 / (6 + 4 + 5 + 3 + 0 + 6 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64530629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1194985 + ... + 1195038.

It is an arithmetic number, because the mean of its divisors is an integer number (11950120).

Almost surely, 2^64530621 is an apocalyptic number.

It is an amenable number.

64530621 is a deficient number, since it is larger than the sum of its proper divisors (31070339).

64530621 is a wasteful number, since it uses less digits than its factorization.

64530621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2390032 (or 2390026 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 64530621 is about 8033.0953560878. The cubic root of 64530621 is about 401.1024193046.

The spelling of 64530621 in words is "sixty-four million, five hundred thirty thousand, six hundred twenty-one".