28477830 has 16 divisors (see below), whose sum is σ = 68346864. Its totient is φ = 7594080.

The previous prime is 28477829. The next prime is 28477837. The reversal of 28477830 is 3877482.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28477837) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 474601 + ... + 474660.

It is an arithmetic number, because the mean of its divisors is an integer number (4271679).

Almost surely, 2^28477830 is an apocalyptic number.

28477830 is an abundant number, since it is smaller than the sum of its proper divisors (39869034).

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

28477830 is a wasteful number, since it uses less digits than its factorization.

28477830 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 949271.

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 28477830 is about 5336.4623113070. The cubic root of 28477830 is about 305.3765125313.

The spelling of 28477830 in words is "twenty-eight million, four hundred seventy-seven thousand, eight hundred thirty".