28698440 has 32 divisors (see below), whose sum is σ = 65794680. Its totient is φ = 11261952.

The previous prime is 28698437. The next prime is 28698463. The reversal of 28698440 is 4489682.

It can be written as a sum of positive squares in 4 ways, for example, as 28665316 + 33124 = 5354^2 + 182^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4649 + ... + 8888.

Almost surely, 2^28698440 is an apocalyptic number.

28698440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28698440 is an abundant number, since it is smaller than the sum of its proper divisors (37096240).

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

28698440 is a wasteful number, since it uses less digits than its factorization.

28698440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13601 (or 13597 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 41.

The square root of 28698440 is about 5357.0924950014. The cubic root of 28698440 is about 306.1630412554.

The spelling of 28698440 in words is "twenty-eight million, six hundred ninety-eight thousand, four hundred forty".