28770144 has 48 divisors (see below), whose sum is σ = 81334512. Its totient is φ = 8851968.

The previous prime is 28770143. The next prime is 28770163. The reversal of 28770144 is 44107782.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28770143) 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, 10279 + ... + 12774.

It is an arithmetic number, because the mean of its divisors is an integer number (1694469).

Almost surely, 2^28770144 is an apocalyptic number.

28770144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28770144 is an abundant number, since it is smaller than the sum of its proper divisors (52564368).

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

28770144 is a wasteful number, since it uses less digits than its factorization.

28770144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23079 (or 23071 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 28770144 is about 5363.7807561458. The cubic root of 28770144 is about 306.4178153421.

The spelling of 28770144 in words is "twenty-eight million, seven hundred seventy thousand, one hundred forty-four".