28789390 has 32 divisors (see below), whose sum is σ = 61138944. Its totient is φ = 9551520.

The previous prime is 28789379. The next prime is 28789393. The reversal of 28789390 is 9398782.

It is a self number, because there is not a number n which added to its sum of digits gives 28789390.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28789393) 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, 4464 + ... + 8803.

It is an arithmetic number, because the mean of its divisors is an integer number (1910592).

Almost surely, 2^28789390 is an apocalyptic number.

28789390 is an abundant number, since it is smaller than the sum of its proper divisors (32349554).

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

28789390 is a wasteful number, since it uses less digits than its factorization.

28789390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13312.

The product of its (nonzero) digits is 217728, while the sum is 46.

The square root of 28789390 is about 5365.5745265535. The cubic root of 28789390 is about 306.4861269309.

The spelling of 28789390 in words is "twenty-eight million, seven hundred eighty-nine thousand, three hundred ninety".