28654997220 has 72 divisors (see below), whose sum is σ = 86956656696. Its totient is φ = 7638124032.

The previous prime is 28654997197. The next prime is 28654997243. The reversal of 28654997220 is 2279945682.

28654997220 is a `hidden beast` number, since 2 + 8 + 6 + 549 + 9 + 72 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (28654997197) and next prime (28654997243).

It can be written as a sum of positive squares in 4 ways, for example, as 9458340516 + 19196656704 = 97254^2 + 138552^2 .

It is a super-2 number, since 2×28654997220² (a number of 22 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

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, 412954 + ... + 477326.

It is an arithmetic number, because the mean of its divisors is an integer number (1207731343).

Almost surely, 2^28654997220 is an apocalyptic number.

28654997220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28654997220 is an abundant number, since it is smaller than the sum of its proper divisors (58301659476).

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

28654997220 is a wasteful number, since it uses less digits than its factorization.

28654997220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66861 (or 66856 counting only the distinct ones).

The product of its (nonzero) digits is 4354560, while the sum is 54.

The spelling of 28654997220 in words is "twenty-eight billion, six hundred fifty-four million, nine hundred ninety-seven thousand, two hundred twenty".