28822731 has 12 divisors (see below), whose sum is σ = 44704872. Its totient is φ = 16470048.

The previous prime is 28822727. The next prime is 28822733. The reversal of 28822731 is 13722882.

It is not a de Polignac number, because 28822731 - 2² = 28822727 is a prime.

It is a super-2 number, since 2×28822731² = 1661499644596722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28822692 and 28822701.

It is not an unprimeable number, because it can be changed into a prime (28822733) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 97890 + ... + 98183.

It is an arithmetic number, because the mean of its divisors is an integer number (3725406).

Almost surely, 2^28822731 is an apocalyptic number.

28822731 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28822731 is a deficient number, since it is larger than the sum of its proper divisors (15882141).

28822731 is a wasteful number, since it uses less digits than its factorization.

28822731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196090 (or 196083 counting only the distinct ones).

The product of its digits is 10752, while the sum is 33.

The square root of 28822731 is about 5368.6805641610. The cubic root of 28822731 is about 306.6043951748.

The spelling of 28822731 in words is "twenty-eight million, eight hundred twenty-two thousand, seven hundred thirty-one".