28917402 has 16 divisors (see below), whose sum is σ = 58024512. Its totient is φ = 9607520.

The previous prime is 28917347. The next prime is 28917403. The reversal of 28917402 is 20471982.

It is a happy number.

It is a super-2 number, since 2×28917402² = 1672432276859208, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28917403) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5883 + ... + 9614.

It is an arithmetic number, because the mean of its divisors is an integer number (3626532).

Almost surely, 2^28917402 is an apocalyptic number.

28917402 is an abundant number, since it is smaller than the sum of its proper divisors (29107110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28917402 is a wasteful number, since it uses less digits than its factorization.

28917402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15813.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 28917402 is about 5377.4903068253. The cubic root of 28917402 is about 306.9397187360.

The spelling of 28917402 in words is "twenty-eight million, nine hundred seventeen thousand, four hundred two".