121636464 has 40 divisors (see below), whose sum is σ = 322724880. Its totient is φ = 39449088.

The previous prime is 121636447. The next prime is 121636481. The reversal of 121636464 is 464636121.

It is an interprime number because it is at equal distance from previous prime (121636447) and next prime (121636481).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32469 + ... + 36020.

It is an arithmetic number, because the mean of its divisors is an integer number (8068122).

Almost surely, 2^121636464 is an apocalyptic number.

It is an amenable number.

121636464 is an abundant number, since it is smaller than the sum of its proper divisors (201088416).

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

121636464 is a wasteful number, since it uses less digits than its factorization.

121636464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68537 (or 68531 counting only the distinct ones).

The product of its digits is 20736, while the sum is 33.

The square root of 121636464 is about 11028.8922381171. The cubic root of 121636464 is about 495.4744476670.

The spelling of 121636464 in words is "one hundred twenty-one million, six hundred thirty-six thousand, four hundred sixty-four".