28619531 has 2 divisors, whose sum is σ = 28619532. Its totient is φ = 28619530.

The previous prime is 28619527. The next prime is 28619557. The reversal of 28619531 is 13591682.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28619531 - 2² = 28619527 is a prime.

It is a super-2 number, since 2×28619531² = 1638155109319922, which contains 22 as substring.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 28619491 and 28619500.

It is not a weakly prime, because it can be changed into another prime (28619501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14309765 + 14309766.

It is an arithmetic number, because the mean of its divisors is an integer number (14309766).

Almost surely, 2^28619531 is an apocalyptic number.

28619531 is a deficient number, since it is larger than the sum of its proper divisors (1).

28619531 is an equidigital number, since it uses as much as digits as its factorization.

28619531 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 35.

The square root of 28619531 is about 5349.7225161685. The cubic root of 28619531 is about 305.8821758635.

The spelling of 28619531 in words is "twenty-eight million, six hundred nineteen thousand, five hundred thirty-one".