78087266890 has 36 divisors (see below), whose sum is σ = 142177127958. Its totient is φ = 30878964480.

The previous prime is 78087266867. The next prime is 78087266923. The reversal of 78087266890 is 9866278087.

It can be written as a sum of positive squares in 3 ways, for example, as 59164238169 + 18923028721 = 243237^2 + 137561^2 .

It is a Smith number, since the sum of its digits (61) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 85715535 + ... + 85716445.

Almost surely, 2^78087266890 is an apocalyptic number.

78087266890 is a deficient number, since it is larger than the sum of its proper divisors (64089861068).

78087266890 is an frugal number, since it uses more digits than its factorization.

78087266890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2023 (or 1015 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 61.

The spelling of 78087266890 in words is "seventy-eight billion, eighty-seven million, two hundred sixty-six thousand, eight hundred ninety".