28657554915780 has 144 divisors (see below), whose sum is σ = 102771921208320. Its totient is φ = 6324425904384.

The previous prime is 28657554915779. The next prime is 28657554915797. The reversal of 28657554915780 is 8751945575682.

It is a happy number.

28657554915780 is a `hidden beast` number, since 2 + 8 + 6 + 5 + 7 + 5 + 5 + 49 + 1 + 578 + 0 = 666.

It is a hoax number, since the sum of its digits (72) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 28657554915699 and 28657554915708.

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, 392102964 + ... + 392176043.

It is an arithmetic number, because the mean of its divisors is an integer number (713693897280).

Almost surely, 2^{28657554915780} is an apocalyptic number.

28657554915780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28657554915780 is an abundant number, since it is smaller than the sum of its proper divisors (74114366292540).

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

28657554915780 is a wasteful number, since it uses less digits than its factorization.

28657554915780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784279058 (or 784279053 counting only the distinct ones).

The product of its (nonzero) digits is 846720000, while the sum is 72.

The spelling of 28657554915780 in words is "twenty-eight trillion, six hundred fifty-seven billion, five hundred fifty-four million, nine hundred fifteen thousand, seven hundred eighty".