77940064500 has 48 divisors (see below), whose sum is σ = 226961472192. Its totient is φ = 20784016800.

The previous prime is 77940064451. The next prime is 77940064513. The reversal of 77940064500 is 546004977.

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, 25978522 + ... + 25981521.

It is an arithmetic number, because the mean of its divisors is an integer number (4728364004).

Almost surely, 2^77940064500 is an apocalyptic number.

It is an amenable number.

77940064500 is an abundant number, since it is smaller than the sum of its proper divisors (149021407692).

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

77940064500 is a wasteful number, since it uses less digits than its factorization.

77940064500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51960065 (or 51960053 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 42.

The spelling of 77940064500 in words is "seventy-seven billion, nine hundred forty million, sixty-four thousand, five hundred".