28440292806 has 48 divisors (see below), whose sum is σ = 64087418304. Its totient is φ = 9452721384.

The previous prime is 28440292781. The next prime is 28440292819. The reversal of 28440292806 is 60829204482.

28440292806 is a `hidden beast` number, since 2 + 84 + 402 + 92 + 80 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84321 + ... + 252963.

It is an arithmetic number, because the mean of its divisors is an integer number (1335154548).

Almost surely, 2^28440292806 is an apocalyptic number.

It is a pronic number, being equal to 168642×168643.

It is a practical number, because each smaller number is the sum of distinct divisors of 28440292806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32043709152).

28440292806 is an abundant number, since it is smaller than the sum of its proper divisors (35647125498).

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

28440292806 is a wasteful number, since it uses less digits than its factorization.

28440292806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169007 (or 168995 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 45.

The spelling of 28440292806 in words is "twenty-eight billion, four hundred forty million, two hundred ninety-two thousand, eight hundred six".