28021620132 has 144 divisors (see below), whose sum is σ = 81965520000. Its totient is φ = 7977415680.

The previous prime is 28021620119. The next prime is 28021620167. The reversal of 28021620132 is 23102612082.

28021620132 is a `hidden beast` number, since 2 + 8 + 0 + 2 + 1 + 620 + 1 + 32 = 666.

It is a super-2 number, since 2×28021620132² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28021620096 and 28021620105.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4028994 + ... + 4035942.

It is an arithmetic number, because the mean of its divisors is an integer number (569205000).

Almost surely, 2^28021620132 is an apocalyptic number.

28021620132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28021620132, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40982760000).

28021620132 is an abundant number, since it is smaller than the sum of its proper divisors (53943899868).

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

28021620132 is a wasteful number, since it uses less digits than its factorization.

28021620132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7586 (or 7581 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The spelling of 28021620132 in words is "twenty-eight billion, twenty-one million, six hundred twenty thousand, one hundred thirty-two".