64999038 has 64 divisors (see below), whose sum is σ = 149990400. Its totient is φ = 18610560.

The previous prime is 64999037. The next prime is 64999087. The reversal of 64999038 is 83099946.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64999037) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 90043 + ... + 90761.

It is an arithmetic number, because the mean of its divisors is an integer number (2343600).

Almost surely, 2^64999038 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64999038, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74995200).

64999038 is an abundant number, since it is smaller than the sum of its proper divisors (84991362).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64999038 is a wasteful number, since it uses less digits than its factorization.

64999038 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 817.

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 64999038 is about 8062.1980873705. The cubic root of 64999038 is about 402.0705922911.

The spelling of 64999038 in words is "sixty-four million, nine hundred ninety-nine thousand, thirty-eight".