28740772 has 6 divisors (see below), whose sum is σ = 50296358. Its totient is φ = 14370384.

The previous prime is 28740743. The next prime is 28740773. The reversal of 28740772 is 27704782.

It can be written as a sum of positive squares in only one way, i.e., 24049216 + 4691556 = 4904^2 + 2166^2 .

It is not an unprimeable number, because it can be changed into a prime (28740773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3592593 + ... + 3592600.

Almost surely, 2^28740772 is an apocalyptic number.

It is an amenable number.

28740772 is a deficient number, since it is larger than the sum of its proper divisors (21555586).

28740772 is a wasteful number, since it uses less digits than its factorization.

28740772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7185197 (or 7185195 counting only the distinct ones).

The product of its (nonzero) digits is 43904, while the sum is 37.

The square root of 28740772 is about 5361.0420628829. The cubic root of 28740772 is about 306.3135038655.

The spelling of 28740772 in words is "twenty-eight million, seven hundred forty thousand, seven hundred seventy-two".