28700947 has 16 divisors (see below), whose sum is σ = 34228224. Its totient is φ = 23760000.

The previous prime is 28700933. The next prime is 28700953. The reversal of 28700947 is 74900782.

It is a happy number.

It is not a de Polignac number, because 28700947 - 2¹¹ = 28698899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28700957) 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, 3322 + ... + 8272.

It is an arithmetic number, because the mean of its divisors is an integer number (2139264).

Almost surely, 2^28700947 is an apocalyptic number.

28700947 is a deficient number, since it is larger than the sum of its proper divisors (5527277).

28700947 is a wasteful number, since it uses less digits than its factorization.

28700947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5010.

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

The square root of 28700947 is about 5357.3264787579. The cubic root of 28700947 is about 306.1719561232.

The spelling of 28700947 in words is "twenty-eight million, seven hundred thousand, nine hundred forty-seven".