28405790 has 48 divisors (see below), whose sum is σ = 61560000. Its totient is φ = 9398592.

The previous prime is 28405781. The next prime is 28405799. The reversal of 28405790 is 9750482.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28405781) and next prime (28405799).

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28405790.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28405799) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13211 + ... + 15209.

It is an arithmetic number, because the mean of its divisors is an integer number (1282500).

Almost surely, 2^28405790 is an apocalyptic number.

28405790 is an abundant number, since it is smaller than the sum of its proper divisors (33154210).

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

28405790 is a wasteful number, since it uses less digits than its factorization.

28405790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049 (or 2042 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 28405790 is about 5329.7082471745. The cubic root of 28405790 is about 305.1187927478.

The spelling of 28405790 in words is "twenty-eight million, four hundred five thousand, seven hundred ninety".