77121172 has 24 divisors (see below), whose sum is σ = 141571584. Its totient is φ = 36716832.

The previous prime is 77121169. The next prime is 77121181. The reversal of 77121172 is 27112177.

It is a self number, because there is not a number n which added to its sum of digits gives 77121172.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1413 + ... + 12499.

It is an arithmetic number, because the mean of its divisors is an integer number (5898816).

Almost surely, 2^77121172 is an apocalyptic number.

It is an amenable number.

77121172 is a deficient number, since it is larger than the sum of its proper divisors (64450412).

77121172 is a wasteful number, since it uses less digits than its factorization.

77121172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11175 (or 11173 counting only the distinct ones).

The product of its digits is 1372, while the sum is 28.

The square root of 77121172 is about 8781.8660887080. The cubic root of 77121172 is about 425.6551317037.

The spelling of 77121172 in words is "seventy-seven million, one hundred twenty-one thousand, one hundred seventy-two".