28977748 has 6 divisors (see below), whose sum is σ = 50711066. Its totient is φ = 14488872.

The previous prime is 28977737. The next prime is 28977749. The reversal of 28977748 is 84777982.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 23833924 + 5143824 = 4882^2 + 2268^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28977695 and 28977704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28977749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3622215 + ... + 3622222.

Almost surely, 2^28977748 is an apocalyptic number.

It is an amenable number.

28977748 is a deficient number, since it is larger than the sum of its proper divisors (21733318).

28977748 is a wasteful number, since it uses less digits than its factorization.

28977748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7244441 (or 7244439 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 52.

The square root of 28977748 is about 5383.0983643251. The cubic root of 28977748 is about 307.1530817787.

The spelling of 28977748 in words is "twenty-eight million, nine hundred seventy-seven thousand, seven hundred forty-eight".