28907023657 has 2 divisors, whose sum is σ = 28907023658. Its totient is φ = 28907023656.

The previous prime is 28907023597. The next prime is 28907023711. The reversal of 28907023657 is 75632070982.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16728576921 + 12178446736 = 129339^2 + 110356^2 .

It is a cyclic number.

It is not a de Polignac number, because 28907023657 - 2¹¹ = 28907021609 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28907023657.

It is not a weakly prime, because it can be changed into another prime (28907020657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14453511828 + 14453511829.

It is an arithmetic number, because the mean of its divisors is an integer number (14453511829).

Almost surely, 2^28907023657 is an apocalyptic number.

It is an amenable number.

28907023657 is a deficient number, since it is larger than the sum of its proper divisors (1).

28907023657 is an equidigital number, since it uses as much as digits as its factorization.

28907023657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 28907023657 in words is "twenty-eight billion, nine hundred seven million, twenty-three thousand, six hundred fifty-seven".