28620297 has 12 divisors (see below), whose sum is σ = 42871920. Its totient is φ = 19080036.

The previous prime is 28620287. The next prime is 28620311. The reversal of 28620297 is 79202682.

28620297 is a `hidden beast` number, since 2 + 8 + 620 + 29 + 7 = 666.

It is not a de Polignac number, because 28620297 - 2⁴ = 28620281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28620217) 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, 58647 + ... + 59132.

It is an arithmetic number, because the mean of its divisors is an integer number (3572660).

Almost surely, 2^28620297 is an apocalyptic number.

28620297 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28620297 is a deficient number, since it is larger than the sum of its proper divisors (14251623).

28620297 is an equidigital number, since it uses as much as digits as its factorization.

28620297 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117794 (or 117782 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 28620297 is about 5349.7941081877. The cubic root of 28620297 is about 305.8849048118.

The spelling of 28620297 in words is "twenty-eight million, six hundred twenty thousand, two hundred ninety-seven".