28697850 has 36 divisors (see below), whose sum is σ = 77102766. Its totient is φ = 7652640.

The previous prime is 28697839. The next prime is 28697861. The reversal of 28697850 is 5879682.

It is an interprime number because it is at equal distance from previous prime (28697839) and next prime (28697861).

It can be written as a sum of positive squares in 3 ways, for example, as 13417569 + 15280281 = 3663^2 + 3909^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a junction number, because it is equal to n+sod(n) for n = 28697796 and 28697805.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 31437 + ... + 32336.

Almost surely, 2^28697850 is an apocalyptic number.

28697850 is an abundant number, since it is smaller than the sum of its proper divisors (48404916).

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

28697850 is a wasteful number, since it uses less digits than its factorization.

28697850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63791 (or 63783 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 28697850 is about 5357.0374275340. The cubic root of 28697850 is about 306.1609431456.

The spelling of 28697850 in words is "twenty-eight million, six hundred ninety-seven thousand, eight hundred fifty".