28770552 has 80 divisors (see below), whose sum is σ = 83417400. Its totient is φ = 9253440.

The previous prime is 28770551. The next prime is 28770601. The reversal of 28770552 is 25507782.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28770551) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 18027 + ... + 19557.

Almost surely, 2^28770552 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28770552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41708700).

28770552 is an abundant number, since it is smaller than the sum of its proper divisors (54646848).

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

28770552 is a wasteful number, since it uses less digits than its factorization.

28770552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1578 (or 1565 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 28770552 is about 5363.8187888854. The cubic root of 28770552 is about 306.4192638098.

The spelling of 28770552 in words is "twenty-eight million, seven hundred seventy thousand, five hundred fifty-two".