28449931 has 2 divisors, whose sum is σ = 28449932. Its totient is φ = 28449930.

The previous prime is 28449907. The next prime is 28449979. The reversal of 28449931 is 13994482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28449931 - 2⁷ = 28449803 is a prime.

It is a super-2 number, since 2×28449931² = 1618797147809522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28449991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14224965 + 14224966.

It is an arithmetic number, because the mean of its divisors is an integer number (14224966).

Almost surely, 2^28449931 is an apocalyptic number.

28449931 is a deficient number, since it is larger than the sum of its proper divisors (1).

28449931 is an equidigital number, since it uses as much as digits as its factorization.

28449931 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 40.

The square root of 28449931 is about 5333.8476731155. The cubic root of 28449931 is about 305.2767567679.

The spelling of 28449931 in words is "twenty-eight million, four hundred forty-nine thousand, nine hundred thirty-one".