64401894 has 24 divisors (see below), whose sum is σ = 139932000. Its totient is φ = 21406608.

The previous prime is 64401893. The next prime is 64401901. The reversal of 64401894 is 49810446.

It is a happy number.

64401894 is a `hidden beast` number, since 644 + 0 + 1 + 8 + 9 + 4 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64401893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1732 + ... + 11480.

It is an arithmetic number, because the mean of its divisors is an integer number (5830500).

Almost surely, 2^64401894 is an apocalyptic number.

64401894 is an abundant number, since it is smaller than the sum of its proper divisors (75530106).

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

64401894 is a wasteful number, since it uses less digits than its factorization.

64401894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10124 (or 10121 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 64401894 is about 8025.0790650311. The cubic root of 64401894 is about 400.8355326644.

The spelling of 64401894 in words is "sixty-four million, four hundred one thousand, eight hundred ninety-four".