64710421 has 4 divisors (see below), whose sum is σ = 64740492. Its totient is φ = 64680352.

The previous prime is 64710413. The next prime is 64710427. The reversal of 64710421 is 12401746.

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 41139396 + 23571025 = 6414^2 + 4855^2 .

It is a cyclic number.

It is not a de Polignac number, because 64710421 - 2³ = 64710413 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 (64710427) 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, 11536 + ... + 16201.

It is an arithmetic number, because the mean of its divisors is an integer number (16185123).

Almost surely, 2^64710421 is an apocalyptic number.

It is an amenable number.

64710421 is a deficient number, since it is larger than the sum of its proper divisors (30071).

64710421 is a wasteful number, since it uses less digits than its factorization.

64710421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30070.

The product of its (nonzero) digits is 1344, while the sum is 25.

The square root of 64710421 is about 8044.2787743837. The cubic root of 64710421 is about 401.4746009500.

The spelling of 64710421 in words is "sixty-four million, seven hundred ten thousand, four hundred twenty-one".