28511193780 has 48 divisors (see below), whose sum is σ = 88701493440. Its totient is φ = 7602984864.

The previous prime is 28511193769. The next prime is 28511193787. The reversal of 28511193780 is 8739111582.

28511193780 is a `hidden beast` number, since 28 + 511 + 1 + 9 + 37 + 80 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28511193787) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 26398714 + ... + 26399793.

It is an arithmetic number, because the mean of its divisors is an integer number (1847947780).

Almost surely, 2^28511193780 is an apocalyptic number.

28511193780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28511193780 is an abundant number, since it is smaller than the sum of its proper divisors (60190299660).

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

28511193780 is a wasteful number, since it uses less digits than its factorization.

28511193780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52798525 (or 52798517 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 45.

The spelling of 28511193780 in words is "twenty-eight billion, five hundred eleven million, one hundred ninety-three thousand, seven hundred eighty".