64371994 has 4 divisors (see below), whose sum is σ = 96557994. Its totient is φ = 32185996.

The previous prime is 64371991. The next prime is 64371997. The reversal of 64371994 is 49917346.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 49917346 = 2 ⋅24958673.

It is an interprime number because it is at equal distance from previous prime (64371991) and next prime (64371997).

It can be written as a sum of positive squares in only one way, i.e., 64240225 + 131769 = 8015^2 + 363^2 .

It is a super-2 number, since 2×64371994² = 8287507223072072, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64371994.

It is not an unprimeable number, because it can be changed into a prime (64371991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16092997 + ... + 16093000.

Almost surely, 2^64371994 is an apocalyptic number.

64371994 is a deficient number, since it is larger than the sum of its proper divisors (32186000).

64371994 is a wasteful number, since it uses less digits than its factorization.

64371994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32185999.

The product of its digits is 163296, while the sum is 43.

The square root of 64371994 is about 8023.2159387617. The cubic root of 64371994 is about 400.7734908158.

The spelling of 64371994 in words is "sixty-four million, three hundred seventy-one thousand, nine hundred ninety-four".