15961128438 has 32 divisors (see below), whose sum is σ = 33336043776. Its totient is φ = 5085104288.

The previous prime is 15961128437. The next prime is 15961128493. The reversal of 15961128438 is 83482116951.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15961128437) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136120 + ... + 224612.

It is an arithmetic number, because the mean of its divisors is an integer number (1041751368).

Almost surely, 2^15961128438 is an apocalyptic number.

15961128438 is an abundant number, since it is smaller than the sum of its proper divisors (17374915338).

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

15961128438 is a wasteful number, since it uses less digits than its factorization.

15961128438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89828.

The product of its digits is 414720, while the sum is 48.

The spelling of 15961128438 in words is "fifteen billion, nine hundred sixty-one million, one hundred twenty-eight thousand, four hundred thirty-eight".