28130238740 has 12 divisors (see below), whose sum is σ = 59073501396. Its totient is φ = 11252095488.

The previous prime is 28130238727. The next prime is 28130238779. The reversal of 28130238740 is 4783203182.

It can be written as a sum of positive squares in 2 ways, for example, as 21761560324 + 6368678416 = 147518^2 + 79804^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28130238694 and 28130238703.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 703255949 + ... + 703255988.

It is an arithmetic number, because the mean of its divisors is an integer number (4922791783).

Almost surely, 2^28130238740 is an apocalyptic number.

28130238740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28130238740 is an abundant number, since it is smaller than the sum of its proper divisors (30943262656).

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

28130238740 is a wasteful number, since it uses less digits than its factorization.

28130238740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1406511946 (or 1406511944 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 38.

The spelling of 28130238740 in words is "twenty-eight billion, one hundred thirty million, two hundred thirty-eight thousand, seven hundred forty".