681872499 has 160 divisors (see below), whose sum is σ = 1379980800. Its totient is φ = 324725760.

The previous prime is 681872479. The next prime is 681872531. The reversal of 681872499 is 994278186.

681872499 is a `hidden beast` number, since 6 + 81 + 8 + 72 + 499 = 666.

It is not a de Polignac number, because 681872499 - 2¹⁵ = 681839731 is a prime.

It is not an unprimeable number, because it can be changed into a prime (681872419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 159 ways as a sum of consecutive naturals, for example, 6255657 + ... + 6255765.

It is an arithmetic number, because the mean of its divisors is an integer number (8624880).

Almost surely, 2^681872499 is an apocalyptic number.

681872499 is an abundant number, since it is smaller than the sum of its proper divisors (698108301).

681872499 is a wasteful number, since it uses less digits than its factorization.

681872499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215 (or 206 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 681872499 is about 26112.6884674865. The cubic root of 681872499 is about 880.1723573383.

The spelling of 681872499 in words is "six hundred eighty-one million, eight hundred seventy-two thousand, four hundred ninety-nine".