28735690 has 16 divisors (see below), whose sum is σ = 52036992. Its totient is φ = 11424784.

The previous prime is 28735669. The next prime is 28735691. The reversal of 28735690 is 9653782.

It is a super-2 number, since 2×28735690² = 1651479759552200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28735691) 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, 6934 + ... + 10273.

It is an arithmetic number, because the mean of its divisors is an integer number (3252312).

Almost surely, 2^28735690 is an apocalyptic number.

28735690 is a deficient number, since it is larger than the sum of its proper divisors (23301302).

28735690 is a wasteful number, since it uses less digits than its factorization.

28735690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17381.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 28735690 is about 5360.5680669123. The cubic root of 28735690 is about 306.2954484820.

The spelling of 28735690 in words is "twenty-eight million, seven hundred thirty-five thousand, six hundred ninety".