28790749 has 8 divisors (see below), whose sum is σ = 31048920. Its totient is φ = 26538816.

The previous prime is 28790731. The next prime is 28790753. The reversal of 28790749 is 94709782.

It can be written as a sum of positive squares in 4 ways, for example, as 5336100 + 23454649 = 2310^2 + 4843^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28790749 - 2¹⁷ = 28659677 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28790699 and 28790708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28790759) 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, 13419 + ... + 15415.

It is an arithmetic number, because the mean of its divisors is an integer number (3881115).

Almost surely, 2^28790749 is an apocalyptic number.

It is an amenable number.

28790749 is a deficient number, since it is larger than the sum of its proper divisors (2258171).

28790749 is a wasteful number, since it uses less digits than its factorization.

28790749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3119.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 28790749 is about 5365.7011657378. The cubic root of 28790749 is about 306.4909494031.

The spelling of 28790749 in words is "twenty-eight million, seven hundred ninety thousand, seven hundred forty-nine".