64274521 has 4 divisors (see below), whose sum is σ = 65642112. Its totient is φ = 62906932.

The previous prime is 64274477. The next prime is 64274543. The reversal of 64274521 is 12547246.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12547246 = 2 ⋅6273623.

It is a cyclic number.

It is not a de Polignac number, because 64274521 - 2⁷ = 64274393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4274521) 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, 683725 + ... + 683818.

It is an arithmetic number, because the mean of its divisors is an integer number (16410528).

Almost surely, 2^64274521 is an apocalyptic number.

It is an amenable number.

64274521 is a deficient number, since it is larger than the sum of its proper divisors (1367591).

64274521 is a wasteful number, since it uses less digits than its factorization.

64274521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1367590.

The product of its digits is 13440, while the sum is 31.

The square root of 64274521 is about 8017.1392029826. The cubic root of 64274521 is about 400.5711029654.

The spelling of 64274521 in words is "sixty-four million, two hundred seventy-four thousand, five hundred twenty-one".