28585991782620 has 144 divisors (see below), whose sum is σ = 90483635092032. Its totient is φ = 7291277199360.

The previous prime is 28585991782609. The next prime is 28585991782633. The reversal of 28585991782620 is 2628719958582.

28585991782620 is a `hidden beast` number, since 2 + 8 + 5 + 8 + 599 + 1 + 7 + 8 + 2 + 6 + 20 = 666.

It is a congruent number.

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, 168384180 + ... + 168553860.

It is an arithmetic number, because the mean of its divisors is an integer number (628358577028).

Almost surely, 2^{28585991782620} is an apocalyptic number.

28585991782620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28585991782620 is an abundant number, since it is smaller than the sum of its proper divisors (61897643309412).

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

28585991782620 is a wasteful number, since it uses less digits than its factorization.

28585991782620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210412 (or 210407 counting only the distinct ones).

The product of its (nonzero) digits is 348364800, while the sum is 72.

The spelling of 28585991782620 in words is "twenty-eight trillion, five hundred eighty-five billion, nine hundred ninety-one million, seven hundred eighty-two thousand, six hundred twenty".