77193812 has 12 divisors (see below), whose sum is σ = 135225300. Its totient is φ = 38558016.

The previous prime is 77193799. The next prime is 77193817. The reversal of 77193812 is 21839177.

It can be written as a sum of positive squares in 2 ways, for example, as 69989956 + 7203856 = 8366^2 + 2684^2 .

It is a super-2 number, since 2×77193812² = 11917769222182688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77193817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5003 + ... + 13394.

It is an arithmetic number, because the mean of its divisors is an integer number (11268775).

Almost surely, 2^77193812 is an apocalyptic number.

It is an amenable number.

77193812 is a deficient number, since it is larger than the sum of its proper divisors (58031488).

77193812 is a wasteful number, since it uses less digits than its factorization.

77193812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19450 (or 19448 counting only the distinct ones).

The product of its digits is 21168, while the sum is 38.

The square root of 77193812 is about 8786.0009105394. Note that the first 3 decimals coincide. The cubic root of 77193812 is about 425.7887304954.

The spelling of 77193812 in words is "seventy-seven million, one hundred ninety-three thousand, eight hundred twelve".