28307455780 has 24 divisors (see below), whose sum is σ = 60332908608. Its totient is φ = 11153982048.

The previous prime is 28307455751. The next prime is 28307455783. The reversal of 28307455780 is 8755470382.

It is not an unprimeable number, because it can be changed into a prime (28307455783) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10561144 + ... + 10563823.

It is an arithmetic number, because the mean of its divisors is an integer number (2513871192).

Almost surely, 2^28307455780 is an apocalyptic number.

28307455780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28307455780 is an abundant number, since it is smaller than the sum of its proper divisors (32025452828).

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

28307455780 is a wasteful number, since it uses less digits than its factorization.

28307455780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21125043 (or 21125041 counting only the distinct ones).

The product of its (nonzero) digits is 1881600, while the sum is 49.

The spelling of 28307455780 in words is "twenty-eight billion, three hundred seven million, four hundred fifty-five thousand, seven hundred eighty".