78617007770 has 48 divisors (see below), whose sum is σ = 164711154888. Its totient is φ = 26938558080.

The previous prime is 78617007767. The next prime is 78617007793. The reversal of 78617007770 is 7770071687.

It can be written as a sum of positive squares in 4 ways, for example, as 47842375441 + 30774632329 = 218729^2 + 175427^2 .

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, 802880 + ... + 895460.

Almost surely, 2^78617007770 is an apocalyptic number.

78617007770 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

78617007770 is an abundant number, since it is smaller than the sum of its proper divisors (86094147118).

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

78617007770 is a wasteful number, since it uses less digits than its factorization.

78617007770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94335 (or 94328 counting only the distinct ones).

The product of its (nonzero) digits is 806736, while the sum is 50.

The spelling of 78617007770 in words is "seventy-eight billion, six hundred seventeen million, seven thousand, seven hundred seventy".