64128994 has 8 divisors (see below), whose sum is σ = 96577488. Its totient is φ = 31936500.

The previous prime is 64128989. The next prime is 64129001. The reversal of 64128994 is 49982146.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×64128994² = 8225055742904072, 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 64128994.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63372 + ... + 64375.

It is an arithmetic number, because the mean of its divisors is an integer number (12072186).

Almost surely, 2^64128994 is an apocalyptic number.

64128994 is a deficient number, since it is larger than the sum of its proper divisors (32448494).

64128994 is a wasteful number, since it uses less digits than its factorization.

64128994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128000.

The product of its digits is 124416, while the sum is 43.

The square root of 64128994 is about 8008.0580667225. The cubic root of 64128994 is about 400.2685571523.

The spelling of 64128994 in words is "sixty-four million, one hundred twenty-eight thousand, nine hundred ninety-four".