29128642 has 4 divisors (see below), whose sum is σ = 43692966. Its totient is φ = 14564320.

The previous prime is 29128621. The next prime is 29128651. The reversal of 29128642 is 24682192.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 22363441 + 6765201 = 4729^2 + 2601^2 .

It is a junction number, because it is equal to n+sod(n) for n = 29128598 and 29128607.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7282159 + ... + 7282162.

Almost surely, 2^29128642 is an apocalyptic number.

29128642 is a deficient number, since it is larger than the sum of its proper divisors (14564324).

29128642 is a wasteful number, since it uses less digits than its factorization.

29128642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14564323.

The product of its digits is 13824, while the sum is 34.

The square root of 29128642 is about 5397.0957004671. The cubic root of 29128642 is about 307.6852986769.

The spelling of 29128642 in words is "twenty-nine million, one hundred twenty-eight thousand, six hundred forty-two".