64871994 has 16 divisors (see below), whose sum is σ = 141539040. Its totient is φ = 19658160.

The previous prime is 64871987. The next prime is 64871999. The reversal of 64871994 is 49917846.

It is not an unprimeable number, because it can be changed into a prime (64871999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 491389 + ... + 491520.

It is an arithmetic number, because the mean of its divisors is an integer number (8846190).

Almost surely, 2^64871994 is an apocalyptic number.

64871994 is an abundant number, since it is smaller than the sum of its proper divisors (76667046).

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

64871994 is a wasteful number, since it uses less digits than its factorization.

64871994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 982925.

The product of its digits is 435456, while the sum is 48.

The square root of 64871994 is about 8054.3152409128. The cubic root of 64871994 is about 401.8084654760.

The spelling of 64871994 in words is "sixty-four million, eight hundred seventy-one thousand, nine hundred ninety-four".