78877273690 has 16 divisors (see below), whose sum is σ = 143442796392. Its totient is φ = 31225641984.

The previous prime is 78877273687. The next prime is 78877273711. The reversal of 78877273690 is 9637277887.

It can be written as a sum of positive squares in 4 ways, for example, as 59461359409 + 19415914281 = 243847^2 + 139341^2 .

It is a super-2 number, since 2×78877273690² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40657419 + ... + 40659358.

Almost surely, 2^78877273690 is an apocalyptic number.

78877273690 is a deficient number, since it is larger than the sum of its proper divisors (64565522702).

78877273690 is a wasteful number, since it uses less digits than its factorization.

78877273690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81316881.

The product of its (nonzero) digits is 49787136, while the sum is 64.

The spelling of 78877273690 in words is "seventy-eight billion, eight hundred seventy-seven million, two hundred seventy-three thousand, six hundred ninety".