28977090 has 64 divisors (see below), whose sum is σ = 75772800. Its totient is φ = 7064064.

The previous prime is 28977089. The next prime is 28977097. The reversal of 28977090 is 9077982.

It is not an unprimeable number, because it can be changed into a prime (28977097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 15654 + ... + 17406.

It is an arithmetic number, because the mean of its divisors is an integer number (1183950).

Almost surely, 2^28977090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28977090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37886400).

28977090 is an abundant number, since it is smaller than the sum of its proper divisors (46795710).

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

28977090 is a wasteful number, since it uses less digits than its factorization.

28977090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 28977090 is about 5383.0372467595. The cubic root of 28977090 is about 307.1507569113.

The spelling of 28977090 in words is "twenty-eight million, nine hundred seventy-seven thousand, ninety".