28702945 has 16 divisors (see below), whose sum is σ = 35516880. Its totient is φ = 22257664.

The previous prime is 28702937. The next prime is 28702967. The reversal of 28702945 is 54920782.

It can be written as a sum of positive squares in 8 ways, for example, as 1203409 + 27499536 = 1097^2 + 5244^2 .

It is a cyclic number.

It is not a de Polignac number, because 28702945 - 2³ = 28702937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22977 + ... + 24193.

It is an arithmetic number, because the mean of its divisors is an integer number (2219805).

Almost surely, 2^28702945 is an apocalyptic number.

It is an amenable number.

28702945 is a deficient number, since it is larger than the sum of its proper divisors (6813935).

28702945 is a wasteful number, since it uses less digits than its factorization.

28702945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1364.

The product of its (nonzero) digits is 40320, while the sum is 37.

The square root of 28702945 is about 5357.5129491211. The cubic root of 28702945 is about 306.1790606202.

The spelling of 28702945 in words is "twenty-eight million, seven hundred two thousand, nine hundred forty-five".