78249687870 has 16 divisors (see below), whose sum is σ = 187799250960. Its totient is φ = 20866583424.

The previous prime is 78249687847. The next prime is 78249687881. The reversal of 78249687870 is 7878694287.

It is a super-2 number, since 2×78249687870² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1304161435 + ... + 1304161494.

It is an arithmetic number, because the mean of its divisors is an integer number (11737453185).

Almost surely, 2^78249687870 is an apocalyptic number.

78249687870 is an abundant number, since it is smaller than the sum of its proper divisors (109549563090).

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

78249687870 is a wasteful number, since it uses less digits than its factorization.

78249687870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2608322939.

The product of its (nonzero) digits is 75866112, while the sum is 66.

The spelling of 78249687870 in words is "seventy-eight billion, two hundred forty-nine million, six hundred eighty-seven thousand, eight hundred seventy".