7879856985 has 576 divisors, whose sum is σ = 20821032960. Its totient is φ = 2771366400.

The previous prime is 7879856977. The next prime is 7879856987. The reversal of 7879856985 is 5896589787.

It is not a de Polignac number, because 7879856985 - 2³ = 7879856977 is a prime.

It is a super-2 number, since 2×7879856985² (a number of 21 digits) contains 22 as substring.

Its product of digits (304819200) is a multiple of the sum of its prime factors (112).

It is not an unprimeable number, because it can be changed into a prime (7879856987) by changing a digit.

It is a polite number, since it can be written in 575 ways as a sum of consecutive naturals, for example, 254188920 + ... + 254188950.

Almost surely, 2^7879856985 is an apocalyptic number.

It is an amenable number.

7879856985 is an abundant number, since it is smaller than the sum of its proper divisors (12941175975).

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

7879856985 is a wasteful number, since it uses less digits than its factorization.

7879856985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112 (or 89 counting only the distinct ones).

The product of its digits is 304819200, while the sum is 72.

The square root of 7879856985 is about 88768.5585384825. The cubic root of 7879856985 is about 1989.9375404417.

The spelling of 7879856985 in words is "seven billion, eight hundred seventy-nine million, eight hundred fifty-six thousand, nine hundred eighty-five".