28697351 has 4 divisors (see below), whose sum is σ = 29623104. Its totient is φ = 27771600.

The previous prime is 28697341. The next prime is 28697359. The reversal of 28697351 is 15379682.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28697351 - 2²² = 24503047 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28697299 and 28697308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28697359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 462830 + ... + 462891.

It is an arithmetic number, because the mean of its divisors is an integer number (7405776).

Almost surely, 2^28697351 is an apocalyptic number.

28697351 is a deficient number, since it is larger than the sum of its proper divisors (925753).

28697351 is an equidigital number, since it uses as much as digits as its factorization.

28697351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 925752.

The product of its digits is 90720, while the sum is 41.

The square root of 28697351 is about 5356.9908530816. The cubic root of 28697351 is about 306.1591686202.

The spelling of 28697351 in words is "twenty-eight million, six hundred ninety-seven thousand, three hundred fifty-one".