28477776 has 40 divisors (see below), whose sum is σ = 74256160. Its totient is φ = 9403776.

The previous prime is 28477763. The next prime is 28477777. The reversal of 28477776 is 67777482.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28477777) 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, 2511 + ... + 7953.

It is an arithmetic number, because the mean of its divisors is an integer number (1856404).

Almost surely, 2^28477776 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 28477776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37128080).

28477776 is an abundant number, since it is smaller than the sum of its proper divisors (45778384).

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

28477776 is a wasteful number, since it uses less digits than its factorization.

28477776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5563 (or 5557 counting only the distinct ones).

The product of its digits is 921984, while the sum is 48.

The square root of 28477776 is about 5336.4572517729. The cubic root of 28477776 is about 305.3763195117.

The spelling of 28477776 in words is "twenty-eight million, four hundred seventy-seven thousand, seven hundred seventy-six".