29688889 has 4 divisors (see below), whose sum is σ = 29735424. Its totient is φ = 29642356.

The previous prime is 29688853. The next prime is 29688931. The reversal of 29688889 is 98888692.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-29688889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29688289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22297 + ... + 23590.

It is an arithmetic number, because the mean of its divisors is an integer number (7433856).

Almost surely, 2^29688889 is an apocalyptic number.

It is an amenable number.

29688889 is a deficient number, since it is larger than the sum of its proper divisors (46535).

29688889 is an equidigital number, since it uses as much as digits as its factorization.

29688889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46534.

The product of its digits is 3981312, while the sum is 58.

The square root of 29688889 is about 5448.7511413167. The cubic root of 29688889 is about 309.6454114216.

The spelling of 29688889 in words is "twenty-nine million, six hundred eighty-eight thousand, eight hundred eighty-nine".