28429690 has 16 divisors (see below), whose sum is σ = 52557192. Its totient is φ = 11064384.

The previous prime is 28429673. The next prime is 28429691. The reversal of 28429690 is 9692482.

It can be written as a sum of positive squares in 4 ways, for example, as 26615281 + 1814409 = 5159^2 + 1347^2 .

It is a super-2 number, since 2×28429690² = 1616494546992200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28429691) 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, 38049 + ... + 38788.

Almost surely, 2^28429690 is an apocalyptic number.

28429690 is a deficient number, since it is larger than the sum of its proper divisors (24127502).

28429690 is a wasteful number, since it uses less digits than its factorization.

28429690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76881.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 28429690 is about 5331.9499247461. The cubic root of 28429690 is about 305.2043421481.

The spelling of 28429690 in words is "twenty-eight million, four hundred twenty-nine thousand, six hundred ninety".