28745630740 has 12 divisors (see below), whose sum is σ = 60365824596. Its totient is φ = 11498252288.

The previous prime is 28745630717. The next prime is 28745630777. The reversal of 28745630740 is 4703654782.

It can be written as a sum of positive squares in 2 ways, for example, as 17850028816 + 10895601924 = 133604^2 + 104382^2 .

It is a super-2 number, since 2×28745630740² (a number of 22 digits) contains 22 as substring.

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, 718640749 + ... + 718640788.

It is an arithmetic number, because the mean of its divisors is an integer number (5030485383).

Almost surely, 2^28745630740 is an apocalyptic number.

28745630740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28745630740 is an abundant number, since it is smaller than the sum of its proper divisors (31620193856).

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

28745630740 is a wasteful number, since it uses less digits than its factorization.

28745630740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1437281546 (or 1437281544 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 46.

The spelling of 28745630740 in words is "twenty-eight billion, seven hundred forty-five million, six hundred thirty thousand, seven hundred forty".