28779525642 has 96 divisors (see below), whose sum is σ = 68711334912. Its totient is φ = 8008320096.

The previous prime is 28779525617. The next prime is 28779525737. The reversal of 28779525642 is 24652597782.

It is a super-2 number, since 2×28779525642² (a number of 22 digits) contains 22 as substring.

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, 4636513 + ... + 4642715.

It is an arithmetic number, because the mean of its divisors is an integer number (715743072).

Almost surely, 2^28779525642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28779525642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34355667456).

28779525642 is an abundant number, since it is smaller than the sum of its proper divisors (39931809270).

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

28779525642 is a wasteful number, since it uses less digits than its factorization.

28779525642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6632 (or 6625 counting only the distinct ones).

The product of its digits is 16934400, while the sum is 57.

The spelling of 28779525642 in words is "twenty-eight billion, seven hundred seventy-nine million, five hundred twenty-five thousand, six hundred forty-two".