28719090 has 32 divisors (see below), whose sum is σ = 76584960. Its totient is φ = 7658352.

The previous prime is 28719073. The next prime is 28719101. The reversal of 28719090 is 9091782.

It is a happy number.

It is a super-2 number, since 2×28719090² = 1649572260856200, which contains 22 as substring.

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, 52914 + ... + 53453.

It is an arithmetic number, because the mean of its divisors is an integer number (2393280).

Almost surely, 2^28719090 is an apocalyptic number.

28719090 is an abundant number, since it is smaller than the sum of its proper divisors (47865870).

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

28719090 is a wasteful number, since it uses less digits than its factorization.

28719090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106383 (or 106377 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 28719090 is about 5359.0194998712. The cubic root of 28719090 is about 306.2364569882.

The spelling of 28719090 in words is "twenty-eight million, seven hundred nineteen thousand, ninety".