28237730 has 8 divisors (see below), whose sum is σ = 50827932. Its totient is φ = 11295088.

The previous prime is 28237709. The next prime is 28237739. The reversal of 28237730 is 3773282.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 27994681 + 243049 = 5291^2 + 493^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (28237739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1411877 + ... + 1411896.

Almost surely, 2^28237730 is an apocalyptic number.

28237730 is a deficient number, since it is larger than the sum of its proper divisors (22590202).

28237730 is a wasteful number, since it uses less digits than its factorization.

28237730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2823780.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 28237730 is about 5313.9185164999. The cubic root of 28237730 is about 304.5158672458.

The spelling of 28237730 in words is "twenty-eight million, two hundred thirty-seven thousand, seven hundred thirty".