77457728550 has 24 divisors (see below), whose sum is σ = 192095167176. Its totient is φ = 20655394240.

The previous prime is 77457728549. The next prime is 77457728561. The reversal of 77457728550 is 5582775477.

It is a hoax number, since the sum of its digits (57) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

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, 258192279 + ... + 258192578.

It is an arithmetic number, because the mean of its divisors is an integer number (8003965299).

Almost surely, 2^77457728550 is an apocalyptic number.

77457728550 is an abundant number, since it is smaller than the sum of its proper divisors (114637438626).

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

77457728550 is a wasteful number, since it uses less digits than its factorization.

77457728550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516384872 (or 516384867 counting only the distinct ones).

The product of its (nonzero) digits is 19208000, while the sum is 57.

The spelling of 77457728550 in words is "seventy-seven billion, four hundred fifty-seven million, seven hundred twenty-eight thousand, five hundred fifty".