64250399 has 4 divisors (see below), whose sum is σ = 66465960. Its totient is φ = 62034840.

The previous prime is 64250371. The next prime is 64250401. The reversal of 64250399 is 99305246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99305246 = 2 ⋅49652623.

It is a cyclic number.

It is not a de Polignac number, because 64250399 - 2²⁰ = 63201823 is a prime.

It is a super-2 number, since 2×64250399² = 8256227543318402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64250309) 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, 1107737 + ... + 1107794.

It is an arithmetic number, because the mean of its divisors is an integer number (16616490).

Almost surely, 2^64250399 is an apocalyptic number.

64250399 is a deficient number, since it is larger than the sum of its proper divisors (2215561).

64250399 is a wasteful number, since it uses less digits than its factorization.

64250399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2215560.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 64250399 is about 8015.6346598382. The cubic root of 64250399 is about 400.5209857234.

The spelling of 64250399 in words is "sixty-four million, two hundred fifty thousand, three hundred ninety-nine".