78537221076 has 48 divisors (see below), whose sum is σ = 186730544000. Its totient is φ = 25687020672.

The previous prime is 78537221071. The next prime is 78537221093. The reversal of 78537221076 is 67012273587.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78537221071) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 156751 + ... + 426198.

Almost surely, 2^78537221076 is an apocalyptic number.

It is an amenable number.

78537221076 is an abundant number, since it is smaller than the sum of its proper divisors (108193322924).

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

78537221076 is a wasteful number, since it uses less digits than its factorization.

78537221076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583168 (or 583166 counting only the distinct ones).

The product of its (nonzero) digits is 987840, while the sum is 48.

The spelling of 78537221076 in words is "seventy-eight billion, five hundred thirty-seven million, two hundred twenty-one thousand, seventy-six".