64750521 has 16 divisors (see below), whose sum is σ = 96481728. Its totient is φ = 38284800.

The previous prime is 64750513. The next prime is 64750523. The reversal of 64750521 is 12505746.

It is not a de Polignac number, because 64750521 - 2³ = 64750513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64750523) 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, 22576 + ... + 25281.

It is an arithmetic number, because the mean of its divisors is an integer number (6030108).

Almost surely, 2^64750521 is an apocalyptic number.

It is an amenable number.

64750521 is a deficient number, since it is larger than the sum of its proper divisors (31731207).

64750521 is a wasteful number, since it uses less digits than its factorization.

64750521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47912.

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 64750521 is about 8046.7708430152. The cubic root of 64750521 is about 401.5575129289.

The spelling of 64750521 in words is "sixty-four million, seven hundred fifty thousand, five hundred twenty-one".