64860421 has 2 divisors, whose sum is σ = 64860422. Its totient is φ = 64860420.

The previous prime is 64860413. The next prime is 64860431. The reversal of 64860421 is 12406846.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36120100 + 28740321 = 6010^2 + 5361^2 .

It is a cyclic number.

It is not a de Polignac number, because 64860421 - 2³ = 64860413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64860431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32430210 + 32430211.

It is an arithmetic number, because the mean of its divisors is an integer number (32430211).

Almost surely, 2^64860421 is an apocalyptic number.

It is an amenable number.

64860421 is a deficient number, since it is larger than the sum of its proper divisors (1).

64860421 is an equidigital number, since it uses as much as digits as its factorization.

64860421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 64860421 is about 8053.5967741128. The cubic root of 64860421 is about 401.7845701829.

The spelling of 64860421 in words is "sixty-four million, eight hundred sixty thousand, four hundred twenty-one".