64121998 has 8 divisors (see below), whose sum is σ = 101245320. Its totient is φ = 30373560.

The previous prime is 64121989. The next prime is 64122007. The reversal of 64121998 is 89912146.

It is an interprime number because it is at equal distance from previous prime (64121989) and next prime (64122007).

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

It is a super-2 number, since 2×64121998² = 8223261255024008, 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 64121998.

It is a congruent number.

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, 843673 + ... + 843748.

It is an arithmetic number, because the mean of its divisors is an integer number (12655665).

Almost surely, 2^64121998 is an apocalyptic number.

64121998 is a deficient number, since it is larger than the sum of its proper divisors (37123322).

64121998 is a wasteful number, since it uses less digits than its factorization.

64121998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1687442.

The product of its digits is 31104, while the sum is 40.

The square root of 64121998 is about 8007.6212447892. The cubic root of 64121998 is about 400.2540011744.

The spelling of 64121998 in words is "sixty-four million, one hundred twenty-one thousand, nine hundred ninety-eight".