28781274502 has 4 divisors (see below), whose sum is σ = 43171911756. Its totient is φ = 14390637250.

The previous prime is 28781274481. The next prime is 28781274527. The reversal of 28781274502 is 20547218782.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 20547218782 = 2 ⋅10273609391.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7195318624 + ... + 7195318627.

It is an arithmetic number, because the mean of its divisors is an integer number (10792977939).

Almost surely, 2^28781274502 is an apocalyptic number.

28781274502 is a deficient number, since it is larger than the sum of its proper divisors (14390637254).

28781274502 is a wasteful number, since it uses less digits than its factorization.

28781274502 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14390637253.

The product of its (nonzero) digits is 501760, while the sum is 46.

The spelling of 28781274502 in words is "twenty-eight billion, seven hundred eighty-one million, two hundred seventy-four thousand, five hundred two".