64121836 has 6 divisors (see below), whose sum is σ = 112213220. Its totient is φ = 32060916.

The previous prime is 64121831. The next prime is 64121839. The reversal of 64121836 is 63812146.

It is a happy number.

It is a super-2 number, since 2×64121836² = 8223219704021792, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 64121798 and 64121807.

It is not an unprimeable number, because it can be changed into a prime (64121831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8015226 + ... + 8015233.

Almost surely, 2^64121836 is an apocalyptic number.

It is an amenable number.

64121836 is a deficient number, since it is larger than the sum of its proper divisors (48091384).

64121836 is a wasteful number, since it uses less digits than its factorization.

64121836 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16030463 (or 16030461 counting only the distinct ones).

The product of its digits is 6912, while the sum is 31.

The square root of 64121836 is about 8007.6111294193. The cubic root of 64121836 is about 400.2536641023.

The spelling of 64121836 in words is "sixty-four million, one hundred twenty-one thousand, eight hundred thirty-six".