15878361690 has 128 divisors (see below), whose sum is σ = 43485880320. Its totient is φ = 4121155584.

The previous prime is 15878361661. The next prime is 15878361767. The reversal of 15878361690 is 9616387851.

15878361690 is a `hidden beast` number, since 15 + 8 + 7 + 8 + 3 + 616 + 9 + 0 = 666.

15878361690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×15878361690² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1813002 + ... + 1821738.

It is an arithmetic number, because the mean of its divisors is an integer number (339733440).

Almost surely, 2^15878361690 is an apocalyptic number.

15878361690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 15878361690, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21742940160).

15878361690 is an abundant number, since it is smaller than the sum of its proper divisors (27607518630).

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

15878361690 is a wasteful number, since it uses less digits than its factorization.

15878361690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8933 (or 8927 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The spelling of 15878361690 in words is "fifteen billion, eight hundred seventy-eight million, three hundred sixty-one thousand, six hundred ninety".