28782690 has 32 divisors (see below), whose sum is σ = 70056576. Its totient is φ = 7566720.

The previous prime is 28782671. The next prime is 28782727. The reversal of 28782690 is 9628782.

It is a happy number.

It is a super-2 number, since 2×28782690² = 1656886487272200, which contains 22 as substring.

It is a Curzon number.

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, 4627 + ... + 8886.

It is an arithmetic number, because the mean of its divisors is an integer number (2189268).

Almost surely, 2^28782690 is an apocalyptic number.

28782690 is an abundant number, since it is smaller than the sum of its proper divisors (41273886).

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

28782690 is a wasteful number, since it uses less digits than its factorization.

28782690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13594.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 28782690 is about 5364.9501395633. The cubic root of 28782690 is about 306.4623494633.

The spelling of 28782690 in words is "twenty-eight million, seven hundred eighty-two thousand, six hundred ninety".