28628890452 has 144 divisors (see below), whose sum is σ = 81134639040. Its totient is φ = 8796148992.

The previous prime is 28628890447. The next prime is 28628890483. The reversal of 28628890452 is 25409882682.

It is a happy number.

28628890452 is a `hidden beast` number, since 2 + 8 + 628 + 8 + 9 + 0 + 4 + 5 + 2 = 666.

It is a super-2 number, since 2×28628890452² (a number of 22 digits) contains 22 as substring.

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

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 662368 + ... + 704264.

Almost surely, 2^28628890452 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28628890452, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40567319520).

28628890452 is an abundant number, since it is smaller than the sum of its proper divisors (52505748588).

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

28628890452 is a wasteful number, since it uses less digits than its factorization.

28628890452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41972 (or 41958 counting only the distinct ones).

The product of its (nonzero) digits is 4423680, while the sum is 54.

The spelling of 28628890452 in words is "twenty-eight billion, six hundred twenty-eight million, eight hundred ninety thousand, four hundred fifty-two".