64249889 has 4 divisors (see below), whose sum is σ = 70090800. Its totient is φ = 58408980.

The previous prime is 64249847. The next prime is 64249891. The reversal of 64249889 is 98894246.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 64249889 - 2¹² = 64245793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64245889) 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, 2920439 + ... + 2920460.

It is an arithmetic number, because the mean of its divisors is an integer number (17522700).

Almost surely, 2^64249889 is an apocalyptic number.

It is an amenable number.

64249889 is a deficient number, since it is larger than the sum of its proper divisors (5840911).

64249889 is a wasteful number, since it uses less digits than its factorization.

64249889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5840910.

The product of its digits is 995328, while the sum is 50.

The square root of 64249889 is about 8015.6028469479. The cubic root of 64249889 is about 400.5199259830.

The spelling of 64249889 in words is "sixty-four million, two hundred forty-nine thousand, eight hundred eighty-nine".