28772016 has 120 divisors (see below), whose sum is σ = 93212784. Its totient is φ = 7580160.

The previous prime is 28771997. The next prime is 28772063. The reversal of 28772016 is 61027782.

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, 30106 + ... + 31046.

Almost surely, 2^28772016 is an apocalyptic number.

28772016 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28772016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46606392).

28772016 is an abundant number, since it is smaller than the sum of its proper divisors (64440768).

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

28772016 is a wasteful number, since it uses less digits than its factorization.

28772016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 979 (or 966 counting only the distinct ones).

The product of its (nonzero) digits is 9408, while the sum is 33.

The square root of 28772016 is about 5363.9552570841. The cubic root of 28772016 is about 306.4244611402.

Adding to 28772016 its reverse (61027782), we get a palindrome (89799798).

The spelling of 28772016 in words is "twenty-eight million, seven hundred seventy-two thousand, sixteen".