64031994 has 24 divisors (see below), whose sum is σ = 149408532. Its totient is φ = 19702080.

The previous prime is 64031969. The next prime is 64032053. The reversal of 64031994 is 49913046.

64031994 is a `hidden beast` number, since 640 + 3 + 1 + 9 + 9 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 61826769 + 2205225 = 7863^2 + 1485^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 136587 + ... + 137054.

Almost surely, 2^64031994 is an apocalyptic number.

64031994 is an abundant number, since it is smaller than the sum of its proper divisors (85376538).

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

64031994 is a wasteful number, since it uses less digits than its factorization.

64031994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273662 (or 273659 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 64031994 is about 8001.9993751562. Note that the first 3 decimals coincide. The cubic root of 64031994 is about 400.0666430628.

It can be divided in two parts, 64031 and 994, that added together give a square (65025 = 255²).

The spelling of 64031994 in words is "sixty-four million, thirty-one thousand, nine hundred ninety-four".