28387190 has 16 divisors (see below), whose sum is σ = 55027728. Its totient is φ = 10481376.

The previous prime is 28387141. The next prime is 28387193. The reversal of 28387190 is 9178382.

It is a super-2 number, since 2×28387190² = 1611665112192200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28387193) 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, 109052 + ... + 109311.

It is an arithmetic number, because the mean of its divisors is an integer number (3439233).

Almost surely, 2^28387190 is an apocalyptic number.

28387190 is a deficient number, since it is larger than the sum of its proper divisors (26640538).

28387190 is a wasteful number, since it uses less digits than its factorization.

28387190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218383.

The product of its (nonzero) digits is 24192, while the sum is 38.

The square root of 28387190 is about 5327.9630253972. The cubic root of 28387190 is about 305.0521813434.

The spelling of 28387190 in words is "twenty-eight million, three hundred eighty-seven thousand, one hundred ninety".