78985923507 has 24 divisors (see below), whose sum is σ = 115386695424. Its totient is φ = 52061130864.

The previous prime is 78985923469. The next prime is 78985923517. The reversal of 78985923507 is 70532958987.

78985923507 is a `hidden beast` number, since 7 + 8 + 9 + 8 + 592 + 35 + 0 + 7 = 666.

It is not a de Polignac number, because 78985923507 - 2¹⁹ = 78985399219 is a prime.

It is a super-2 number, since 2×78985923507² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78985923517) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 402858 + ... + 565920.

It is an arithmetic number, because the mean of its divisors is an integer number (4807778976).

Almost surely, 2^78985923507 is an apocalyptic number.

78985923507 is a deficient number, since it is larger than the sum of its proper divisors (36400771917).

78985923507 is a wasteful number, since it uses less digits than its factorization.

78985923507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163679 (or 163676 counting only the distinct ones).

The product of its (nonzero) digits is 38102400, while the sum is 63.

The spelling of 78985923507 in words is "seventy-eight billion, nine hundred eighty-five million, nine hundred twenty-three thousand, five hundred seven".