28861930 has 16 divisors (see below), whose sum is σ = 53627904. Its totient is φ = 11172240.

The previous prime is 28861897. The next prime is 28861933. The reversal of 28861930 is 3916882.

It is a super-2 number, since 2×28861930² = 1666022006649800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28861930.

It is not an unprimeable number, because it can be changed into a prime (28861933) 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, 46242 + ... + 46861.

It is an arithmetic number, because the mean of its divisors is an integer number (3351744).

Almost surely, 2^28861930 is an apocalyptic number.

28861930 is a deficient number, since it is larger than the sum of its proper divisors (24765974).

28861930 is a wasteful number, since it uses less digits than its factorization.

28861930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93141.

The product of its (nonzero) digits is 20736, while the sum is 37.

The square root of 28861930 is about 5372.3300345381. The cubic root of 28861930 is about 306.7433265083.

It can be divided in two parts, 28861 and 930, that added together give a cube (29791 = 31³).

The spelling of 28861930 in words is "twenty-eight million, eight hundred sixty-one thousand, nine hundred thirty".