28987372491 has 16 divisors (see below), whose sum is σ = 48186801408. Its totient is φ = 15058375200.

The previous prime is 28987372451. The next prime is 28987372511. The reversal of 28987372491 is 19427378982.

It is not a de Polignac number, because 28987372491 - 2¹⁴ = 28987356107 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28987372411) 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, 62743000 + ... + 62743461.

It is an arithmetic number, because the mean of its divisors is an integer number (3011675088).

Almost surely, 2^28987372491 is an apocalyptic number.

28987372491 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28987372491 is a deficient number, since it is larger than the sum of its proper divisors (19199428917).

28987372491 is a wasteful number, since it uses less digits than its factorization.

28987372491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125486482.

The product of its digits is 12192768, while the sum is 60.

The spelling of 28987372491 in words is "twenty-eight billion, nine hundred eighty-seven million, three hundred seventy-two thousand, four hundred ninety-one".