121577868 has 36 divisors (see below), whose sum is σ = 315499240. Its totient is φ = 40487760.

The previous prime is 121577843. The next prime is 121577873. The reversal of 121577868 is 868775121.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

121577868 is a `hidden beast` number, since 12 + 1 + 577 + 8 + 68 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114058 + ... + 115118.

Almost surely, 2^121577868 is an apocalyptic number.

121577868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

121577868 is an abundant number, since it is smaller than the sum of its proper divisors (193921372).

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

121577868 is an equidigital number, since it uses as much as digits as its factorization.

121577868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135 (or 1066 counting only the distinct ones).

The product of its digits is 188160, while the sum is 45.

The square root of 121577868 is about 11026.2354409835. The cubic root of 121577868 is about 495.3948731627.

The spelling of 121577868 in words is "one hundred twenty-one million, five hundred seventy-seven thousand, eight hundred sixty-eight".