28240690 has 16 divisors (see below), whose sum is σ = 52473600. Its totient is φ = 10931760.

The previous prime is 28240673. The next prime is 28240691. The reversal of 28240690 is 9604282.

It is a super-2 number, since 2×28240690² = 1595073143352200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (28240691) 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, 45240 + ... + 45859.

It is an arithmetic number, because the mean of its divisors is an integer number (3279600).

Almost surely, 2^28240690 is an apocalyptic number.

28240690 is a deficient number, since it is larger than the sum of its proper divisors (24232910).

28240690 is a wasteful number, since it uses less digits than its factorization.

28240690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91137.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 28240690 is about 5314.1970230694. The cubic root of 28240690 is about 304.5265070939.

The spelling of 28240690 in words is "twenty-eight million, two hundred forty thousand, six hundred ninety".