28742266 has 16 divisors (see below), whose sum is σ = 50605056. Its totient is φ = 11984976.

The previous prime is 28742251. The next prime is 28742267. The reversal of 28742266 is 66224782.

It is a super-2 number, since 2×28742266² = 1652235709629512, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is not an unprimeable number, because it can be changed into a prime (28742267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27226 + ... + 28261.

It is an arithmetic number, because the mean of its divisors is an integer number (3162816).

Almost surely, 2^28742266 is an apocalyptic number.

28742266 is a deficient number, since it is larger than the sum of its proper divisors (21862790).

28742266 is a wasteful number, since it uses less digits than its factorization.

28742266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55533.

The product of its digits is 64512, while the sum is 37.

The square root of 28742266 is about 5361.1813996544. The cubic root of 28742266 is about 306.3188113598.

The spelling of 28742266 in words is "twenty-eight million, seven hundred forty-two thousand, two hundred sixty-six".