28877648331 has 32 divisors (see below), whose sum is σ = 45765626368. Its totient is φ = 15853501440.

The previous prime is 28877648329. The next prime is 28877648357. The reversal of 28877648331 is 13384677882.

It is a happy number.

It is not a de Polignac number, because 28877648331 - 2¹ = 28877648329 is a prime.

It is a super-2 number, since 2×28877648331² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28877648431) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 207046 + ... + 317211.

It is an arithmetic number, because the mean of its divisors is an integer number (1430175824).

Almost surely, 2^28877648331 is an apocalyptic number.

28877648331 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28877648331 is a deficient number, since it is larger than the sum of its proper divisors (16887978037).

28877648331 is a wasteful number, since it uses less digits than its factorization.

28877648331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 524371.

The product of its digits is 10838016, while the sum is 57.

The spelling of 28877648331 in words is "twenty-eight billion, eight hundred seventy-seven million, six hundred forty-eight thousand, three hundred thirty-one".