77121006 has 16 divisors (see below), whose sum is σ = 154332624. Its totient is φ = 25691904.

The previous prime is 77120971. The next prime is 77121007. The reversal of 77121006 is 60012177.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77121007) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13080 + ... + 18036.

It is an arithmetic number, because the mean of its divisors is an integer number (9645789).

Almost surely, 2^77121006 is an apocalyptic number.

77121006 is an abundant number, since it is smaller than the sum of its proper divisors (77211618).

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

77121006 is a wasteful number, since it uses less digits than its factorization.

77121006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7555.

The product of its (nonzero) digits is 588, while the sum is 24.

The square root of 77121006 is about 8781.8566374087. The cubic root of 77121006 is about 425.6548263020.

The spelling of 77121006 in words is "seventy-seven million, one hundred twenty-one thousand, six".