64075421 has 4 divisors (see below), whose sum is σ = 64407612. Its totient is φ = 63743232.

The previous prime is 64075411. The next prime is 64075457. The reversal of 64075421 is 12457046.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6528025 + 57547396 = 2555^2 + 7586^2 .

It is a cyclic number.

It is not a de Polignac number, because 64075421 - 2²² = 59881117 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 (64075411) 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, 165806 + ... + 166191.

It is an arithmetic number, because the mean of its divisors is an integer number (16101903).

Almost surely, 2^64075421 is an apocalyptic number.

It is an amenable number.

64075421 is a deficient number, since it is larger than the sum of its proper divisors (332191).

64075421 is a wasteful number, since it uses less digits than its factorization.

64075421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332190.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 64075421 is about 8004.7124245659. The cubic root of 64075421 is about 400.1570654014.

The spelling of 64075421 in words is "sixty-four million, seventy-five thousand, four hundred twenty-one".