28772790 has 16 divisors (see below), whose sum is σ = 69054768. Its totient is φ = 7672736.

The previous prime is 28772771. The next prime is 28772797. The reversal of 28772790 is 9727782.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28772797) 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, 479517 + ... + 479576.

It is an arithmetic number, because the mean of its divisors is an integer number (4315923).

Almost surely, 2^28772790 is an apocalyptic number.

28772790 is an abundant number, since it is smaller than the sum of its proper divisors (40281978).

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

28772790 is a wasteful number, since it uses less digits than its factorization.

28772790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 959103.

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 28772790 is about 5364.0274048517. The cubic root of 28772790 is about 306.4272088379.

The spelling of 28772790 in words is "twenty-eight million, seven hundred seventy-two thousand, seven hundred ninety".