29121864 has 32 divisors (see below), whose sum is σ = 75971520. Its totient is φ = 9285056.

The previous prime is 29121863. The next prime is 29121871. The reversal of 29121864 is 46812192.

It is not an unprimeable number, because it can be changed into a prime (29121863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25827 + ... + 26930.

It is an arithmetic number, because the mean of its divisors is an integer number (2374110).

Almost surely, 2^29121864 is an apocalyptic number.

29121864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

29121864 is an abundant number, since it is smaller than the sum of its proper divisors (46849656).

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

29121864 is a wasteful number, since it uses less digits than its factorization.

29121864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52789 (or 52785 counting only the distinct ones).

The product of its digits is 6912, while the sum is 33.

The square root of 29121864 is about 5396.4677336198. The cubic root of 29121864 is about 307.6614315300.

It can be divided in two parts, 291 and 21864, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 29121864 in words is "twenty-nine million, one hundred twenty-one thousand, eight hundred sixty-four".