28619730 has 80 divisors (see below), whose sum is σ = 78015960. Its totient is φ = 7527168.

The previous prime is 28619729. The next prime is 28619743. The reversal of 28619730 is 3791682.

28619730 is a `hidden beast` number, since 2 + 8 + 619 + 7 + 30 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 20985561 + 7634169 = 4581^2 + 2763^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 71892 + ... + 72288.

Almost surely, 2^28619730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28619730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39007980).

28619730 is an abundant number, since it is smaller than the sum of its proper divisors (49396230).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28619730 is a wasteful number, since it uses less digits than its factorization.

28619730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505 (or 496 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 28619730 is about 5349.7411152317. The cubic root of 28619730 is about 305.8828848248.

The spelling of 28619730 in words is "twenty-eight million, six hundred nineteen thousand, seven hundred thirty".