28003690 has 32 divisors (see below), whose sum is σ = 59222016. Its totient is φ = 9399360.

The previous prime is 28003687. The next prime is 28003691. The reversal of 28003690 is 9630082.

It is a super-2 number, since 2×28003690² = 1568413307232200, which contains 22 as substring.

28003690 is a modest number, since divided by 3690 gives 280 as remainder.

It is not an unprimeable number, because it can be changed into a prime (28003691) 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, 8362 + ... + 11221.

It is an arithmetic number, because the mean of its divisors is an integer number (1850688).

Almost surely, 2^28003690 is an apocalyptic number.

28003690 is an abundant number, since it is smaller than the sum of its proper divisors (31218326).

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

28003690 is a wasteful number, since it uses less digits than its factorization.

28003690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19614.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 28003690 is about 5291.8512828688. The cubic root of 28003690 is about 303.6722359032.

It can be divided in two parts, 280036 and 90, that added together give a triangular number (280126 = T₇₄₈).

The spelling of 28003690 in words is "twenty-eight million, three thousand, six hundred ninety".