28378707770 has 64 divisors (see below), whose sum is σ = 60433793280. Its totient is φ = 9387850752.

The previous prime is 28378707751. The next prime is 28378707787. The reversal of 28378707770 is 7770787382.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3603377 + ... + 3611243.

It is an arithmetic number, because the mean of its divisors is an integer number (944278020).

Almost surely, 2^28378707770 is an apocalyptic number.

28378707770 is an abundant number, since it is smaller than the sum of its proper divisors (32055085510).

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

28378707770 is a wasteful number, since it uses less digits than its factorization.

28378707770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9687.

The product of its (nonzero) digits is 6453888, while the sum is 56.

The spelling of 28378707770 in words is "twenty-eight billion, three hundred seventy-eight million, seven hundred seven thousand, seven hundred seventy".