28976778 has 48 divisors (see below), whose sum is σ = 65825760. Its totient is φ = 9552816.

The previous prime is 28976747. The next prime is 28976813. The reversal of 28976778 is 87767982.

It is a super-2 number, since 2×28976778² = 1679307326522568, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52701 + ... + 53247.

It is an arithmetic number, because the mean of its divisors is an integer number (1371370).

Almost surely, 2^28976778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28976778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32912880).

28976778 is an abundant number, since it is smaller than the sum of its proper divisors (36848982).

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

28976778 is a wasteful number, since it uses less digits than its factorization.

28976778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673 (or 661 counting only the distinct ones).

The product of its digits is 2370816, while the sum is 54.

The square root of 28976778 is about 5383.0082667594. The cubic root of 28976778 is about 307.1496545303.

The spelling of 28976778 in words is "twenty-eight million, nine hundred seventy-six thousand, seven hundred seventy-eight".