28820406 has 32 divisors (see below), whose sum is σ = 62460288. Its totient is φ = 8830080.

The previous prime is 28820401. The next prime is 28820411. The reversal of 28820406 is 60402882.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28820401) and next prime (28820411).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28820401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1101 + ... + 7671.

It is an arithmetic number, because the mean of its divisors is an integer number (1951884).

Almost surely, 2^28820406 is an apocalyptic number.

28820406 is an abundant number, since it is smaller than the sum of its proper divisors (33639882).

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

28820406 is a wasteful number, since it uses less digits than its factorization.

28820406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6636.

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 28820406 is about 5368.4640261438. The cubic root of 28820406 is about 306.5961508209.

The spelling of 28820406 in words is "twenty-eight million, eight hundred twenty thousand, four hundred six".