15378891640 has 64 divisors (see below), whose sum is σ = 40614552000. Its totient is φ = 5130252288.

The previous prime is 15378891569. The next prime is 15378891659. The reversal of 15378891640 is 4619887351.

15378891640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 731865 + ... + 752584.

It is an arithmetic number, because the mean of its divisors is an integer number (634602375).

Almost surely, 2^15378891640 is an apocalyptic number.

15378891640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15378891640 is an abundant number, since it is smaller than the sum of its proper divisors (25235660360).

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

15378891640 is a wasteful number, since it uses less digits than its factorization.

15378891640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1484504 (or 1484500 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 52.

The spelling of 15378891640 in words is "fifteen billion, three hundred seventy-eight million, eight hundred ninety-one thousand, six hundred forty".