28961512290 has 96 divisors (see below), whose sum is σ = 81036639216. Its totient is φ = 7149588480.

The previous prime is 28961512271. The next prime is 28961512291. The reversal of 28961512290 is 9221516982.

It is a happy number.

28961512290 is a `hidden beast` number, since 2 + 8 + 9 + 615 + 1 + 2 + 29 + 0 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 18844974729 + 10116537561 = 137277^2 + 100581^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28961512291) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 61827 + ... + 248486.

Almost surely, 2^28961512290 is an apocalyptic number.

28961512290 is an abundant number, since it is smaller than the sum of its proper divisors (52075126926).

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

28961512290 is a wasteful number, since it uses less digits than its factorization.

28961512290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310404 (or 310401 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 45.

The spelling of 28961512290 in words is "twenty-eight billion, nine hundred sixty-one million, five hundred twelve thousand, two hundred ninety".