28700749 has 16 divisors (see below), whose sum is σ = 37019520. Its totient is φ = 21591360.

The previous prime is 28700747. The next prime is 28700759. The reversal of 28700749 is 94700782.

It is a happy number.

It is not a de Polignac number, because 28700749 - 2¹ = 28700747 is a prime.

It is a super-2 number, since 2×28700749² = 1647465986322002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28700741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4194 + ... + 8659.

It is an arithmetic number, because the mean of its divisors is an integer number (2313720).

Almost surely, 2^28700749 is an apocalyptic number.

28700749 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28700749 is a deficient number, since it is larger than the sum of its proper divisors (8318771).

28700749 is a wasteful number, since it uses less digits than its factorization.

28700749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12900.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 28700749 is about 5357.3079993594. The cubic root of 28700749 is about 306.1712520560.

The spelling of 28700749 in words is "twenty-eight million, seven hundred thousand, seven hundred forty-nine".