28661134680 has 96 divisors (see below), whose sum is σ = 93973145760. Its totient is φ = 7575321600.

The previous prime is 28661134679. The next prime is 28661134753. The reversal of 28661134680 is 8643116682.

28661134680 is a `hidden beast` number, since 28 + 6 + 611 + 3 + 4 + 6 + 8 + 0 = 666.

It is a super-2 number, since 2×28661134680² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 23 ways as a sum of consecutive naturals, for example, 311596 + ... + 392955.

It is an arithmetic number, because the mean of its divisors is an integer number (978886935).

Almost surely, 2^28661134680 is an apocalyptic number.

28661134680 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28661134680 is an abundant number, since it is smaller than the sum of its proper divisors (65312011080).

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

28661134680 is a wasteful number, since it uses less digits than its factorization.

28661134680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704681 (or 704674 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The spelling of 28661134680 in words is "twenty-eight billion, six hundred sixty-one million, one hundred thirty-four thousand, six hundred eighty".