28779948 has 72 divisors (see below), whose sum is σ = 78121680. Its totient is φ = 9253440.

The previous prime is 28779941. The next prime is 28779973. The reversal of 28779948 is 84997782.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a junction number, because it is equal to n+sod(n) for n = 28779894 and 28779903.

It is not an unprimeable number, because it can be changed into a prime (28779941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27678 + ... + 28698.

Almost surely, 2^28779948 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 28779948, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39060840).

28779948 is an abundant number, since it is smaller than the sum of its proper divisors (49341732).

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

28779948 is a wasteful number, since it uses less digits than its factorization.

28779948 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1069 (or 1055 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 28779948 is about 5364.6945859014. The cubic root of 28779948 is about 306.4526173819.

The spelling of 28779948 in words is "twenty-eight million, seven hundred seventy-nine thousand, nine hundred forty-eight".