28930631 has 2 divisors, whose sum is σ = 28930632. Its totient is φ = 28930630.

The previous prime is 28930621. The next prime is 28930637. The reversal of 28930631 is 13603982.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28930631 - 2⁶ = 28930567 is a prime.

It is a super-2 number, since 2×28930631² = 1673962820116322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28930637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14465315 + 14465316.

It is an arithmetic number, because the mean of its divisors is an integer number (14465316).

Almost surely, 2^28930631 is an apocalyptic number.

28930631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28930631 is an equidigital number, since it uses as much as digits as its factorization.

28930631 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 28930631 is about 5378.7202009400. The cubic root of 28930631 is about 306.9865173904.

The spelling of 28930631 in words is "twenty-eight million, nine hundred thirty thousand, six hundred thirty-one".