78723120550 has 48 divisors (see below), whose sum is σ = 147537869472. Its totient is φ = 31250419200.

The previous prime is 78723120547. The next prime is 78723120577. The reversal of 78723120550 is 5502132787.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6910159 + ... + 6921541.

It is an arithmetic number, because the mean of its divisors is an integer number (3073705614).

Almost surely, 2^78723120550 is an apocalyptic number.

78723120550 is a deficient number, since it is larger than the sum of its proper divisors (68814748922).

78723120550 is a wasteful number, since it uses less digits than its factorization.

78723120550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12433 (or 12428 counting only the distinct ones).

The product of its (nonzero) digits is 117600, while the sum is 40.

The spelling of 78723120550 in words is "seventy-eight billion, seven hundred twenty-three million, one hundred twenty thousand, five hundred fifty".