77774117428 has 48 divisors (see below), whose sum is σ = 165228021504. Its totient is φ = 31270141440.

The previous prime is 77774117389. The next prime is 77774117431. The reversal of 77774117428 is 82471147777.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114651 + ... + 410722.

It is an arithmetic number, because the mean of its divisors is an integer number (3442250448).

Almost surely, 2^77774117428 is an apocalyptic number.

It is an amenable number.

77774117428 is an abundant number, since it is smaller than the sum of its proper divisors (87453904076).

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

77774117428 is a wasteful number, since it uses less digits than its factorization.

77774117428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525712 (or 525710 counting only the distinct ones).

The product of its digits is 4302592, while the sum is 55.

The spelling of 77774117428 in words is "seventy-seven billion, seven hundred seventy-four million, one hundred seventeen thousand, four hundred twenty-eight".