28070740 has 24 divisors (see below), whose sum is σ = 62416872. Its totient is φ = 10567680.

The previous prime is 28070737. The next prime is 28070759. The reversal of 28070740 is 4707082.

It can be written as a sum of positive squares in 4 ways, for example, as 10329796 + 17740944 = 3214^2 + 4212^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28070699 and 28070708.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40941 + ... + 41620.

It is an arithmetic number, because the mean of its divisors is an integer number (2600703).

Almost surely, 2^28070740 is an apocalyptic number.

28070740 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28070740 is an abundant number, since it is smaller than the sum of its proper divisors (34346132).

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

28070740 is a wasteful number, since it uses less digits than its factorization.

28070740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82587 (or 82585 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 28.

The square root of 28070740 is about 5298.1827073063. The cubic root of 28070740 is about 303.9144063043.

The spelling of 28070740 in words is "twenty-eight million, seventy thousand, seven hundred forty".