28070715 has 16 divisors (see below), whose sum is σ = 45001728. Its totient is φ = 14941536.

The previous prime is 28070681. The next prime is 28070737. The reversal of 28070715 is 51707082.

It is a happy number.

It is not a de Polignac number, because 28070715 - 2⁸ = 28070459 is a prime.

It is a super-2 number, since 2×28070715² = 1575930081222450, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7564 + ... + 10646.

It is an arithmetic number, because the mean of its divisors is an integer number (2812608).

Almost surely, 2^28070715 is an apocalyptic number.

28070715 is a deficient number, since it is larger than the sum of its proper divisors (16931013).

28070715 is a wasteful number, since it uses less digits than its factorization.

28070715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3698.

The product of its (nonzero) digits is 3920, while the sum is 30.

The square root of 28070715 is about 5298.1803480063. The cubic root of 28070715 is about 303.9143160815.

Adding to 28070715 its reverse (51707082), we get a palindrome (79777797).

The spelling of 28070715 in words is "twenty-eight million, seventy thousand, seven hundred fifteen".