15128491872 has 48 divisors (see below), whose sum is σ = 42767086320. Its totient is φ = 4654920192.

The previous prime is 15128491871. The next prime is 15128491927. The reversal of 15128491872 is 27819482151.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15128491871) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6059847 + ... + 6062342.

It is an arithmetic number, because the mean of its divisors is an integer number (890980965).

Almost surely, 2^15128491872 is an apocalyptic number.

15128491872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

15128491872 is an abundant number, since it is smaller than the sum of its proper divisors (27638594448).

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

15128491872 is a wasteful number, since it uses less digits than its factorization.

15128491872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12122215 (or 12122207 counting only the distinct ones).

The product of its digits is 322560, while the sum is 48.

The spelling of 15128491872 in words is "fifteen billion, one hundred twenty-eight million, four hundred ninety-one thousand, eight hundred seventy-two".