28961713 has 12 divisors (see below), whose sum is σ = 32699380. Its totient is φ = 25613280.

The previous prime is 28961711. The next prime is 28961717. The reversal of 28961713 is 31716982.

It can be written as a sum of positive squares in 2 ways, for example, as 13017664 + 15944049 = 3608^2 + 3993^2 .

It is not a de Polignac number, because 28961713 - 2¹ = 28961711 is a prime.

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28961711) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1243 + ... + 7711.

Almost surely, 2^28961713 is an apocalyptic number.

It is an amenable number.

28961713 is a deficient number, since it is larger than the sum of its proper divisors (3737667).

28961713 is a wasteful number, since it uses less digits than its factorization.

28961713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6528 (or 6517 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 28961713 is about 5381.6087743351. The cubic root of 28961713 is about 307.0964163630.

The spelling of 28961713 in words is "twenty-eight million, nine hundred sixty-one thousand, seven hundred thirteen".