28442731 has 2 divisors, whose sum is σ = 28442732. Its totient is φ = 28442730.

The previous prime is 28442723. The next prime is 28442741. The reversal of 28442731 is 13724482.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 28442731 - 2³ = 28442723 is a prime.

It is a super-2 number, since 2×28442731² = 1617977893476722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28442693 and 28442702.

It is not a weakly prime, because it can be changed into another prime (28442741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14221365 + 14221366.

It is an arithmetic number, because the mean of its divisors is an integer number (14221366).

Almost surely, 2^28442731 is an apocalyptic number.

28442731 is a deficient number, since it is larger than the sum of its proper divisors (1).

28442731 is an equidigital number, since it uses as much as digits as its factorization.

28442731 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10752, while the sum is 31.

The square root of 28442731 is about 5333.1726954975. The cubic root of 28442731 is about 305.2510018362.

The spelling of 28442731 in words is "twenty-eight million, four hundred forty-two thousand, seven hundred thirty-one".