64399941 has 20 divisors (see below), whose sum is σ = 96433612. Its totient is φ = 42830208.

The previous prime is 64399921. The next prime is 64399963. The reversal of 64399941 is 14999346.

It can be written as a sum of positive squares in 2 ways, for example, as 32251041 + 32148900 = 5679^2 + 5670^2 .

It is not a de Polignac number, because 64399941 - 2⁷ = 64399813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64399921) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 49005 + ... + 50301.

Almost surely, 2^64399941 is an apocalyptic number.

It is an amenable number.

64399941 is a deficient number, since it is larger than the sum of its proper divisors (32033671).

64399941 is a wasteful number, since it uses less digits than its factorization.

64399941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922 (or 1913 counting only the distinct ones).

The product of its digits is 209952, while the sum is 45.

The square root of 64399941 is about 8024.9573830644. The cubic root of 64399941 is about 400.8314808182.

The spelling of 64399941 in words is "sixty-four million, three hundred ninety-nine thousand, nine hundred forty-one".