28537631 has 2 divisors, whose sum is σ = 28537632. Its totient is φ = 28537630.

The previous prime is 28537589. The next prime is 28537633. The reversal of 28537631 is 13673582.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28537631 - 2⁶ = 28537567 is a prime.

It is a super-2 number, since 2×28537631² = 1628792766184322, which contains 22 as substring.

Together with 28537633, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28537591 and 28537600.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28537633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14268815 + 14268816.

It is an arithmetic number, because the mean of its divisors is an integer number (14268816).

Almost surely, 2^28537631 is an apocalyptic number.

28537631 is a deficient number, since it is larger than the sum of its proper divisors (1).

28537631 is an equidigital number, since it uses as much as digits as its factorization.

28537631 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 28537631 is about 5342.0624294368. The cubic root of 28537631 is about 305.5901179098.

The spelling of 28537631 in words is "twenty-eight million, five hundred thirty-seven thousand, six hundred thirty-one".