28738330 has 16 divisors (see below), whose sum is σ = 54772200. Its totient is φ = 10819072.

The previous prime is 28738321. The next prime is 28738343. The reversal of 28738330 is 3383782.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 25979409 + 2758921 = 5097^2 + 1661^2 .

It is a super-2 number, since 2×28738330² = 1651783222377800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84355 + ... + 84694.

Almost surely, 2^28738330 is an apocalyptic number.

28738330 is a deficient number, since it is larger than the sum of its proper divisors (26033870).

28738330 is a wasteful number, since it uses less digits than its factorization.

28738330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169073.

The product of its (nonzero) digits is 24192, while the sum is 34.

The square root of 28738330 is about 5360.8143038162. The cubic root of 28738330 is about 306.3048281677.

The spelling of 28738330 in words is "twenty-eight million, seven hundred thirty-eight thousand, three hundred thirty".