28700386 has 32 divisors (see below), whose sum is σ = 53561088. Its totient is φ = 11331840.

The previous prime is 28700381. The next prime is 28700387. The reversal of 28700386 is 68300782.

It is a happy number.

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

It is not an unprimeable number, because it can be changed into a prime (28700381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1911 + ... + 7813.

It is an arithmetic number, because the mean of its divisors is an integer number (1673784).

Almost surely, 2^28700386 is an apocalyptic number.

28700386 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

28700386 is a deficient number, since it is larger than the sum of its proper divisors (24860702).

28700386 is a wasteful number, since it uses less digits than its factorization.

28700386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5946.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 28700386 is about 5357.2741202966. The cubic root of 28700386 is about 306.1699612577.

The spelling of 28700386 in words is "twenty-eight million, seven hundred thousand, three hundred eighty-six".