29278561 has 8 divisors (see below), whose sum is σ = 31588200. Its totient is φ = 26977152.

The previous prime is 29278541. The next prime is 29278567. The reversal of 29278561 is 16587292.

It can be written as a sum of positive squares in 4 ways, for example, as 2560000 + 26718561 = 1600^2 + 5169^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 29278561 - 2⁹ = 29278049 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (29278567) 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, 6765 + ... + 10213.

It is an arithmetic number, because the mean of its divisors is an integer number (3948525).

Almost surely, 2^29278561 is an apocalyptic number.

It is an amenable number.

29278561 is a deficient number, since it is larger than the sum of its proper divisors (2309639).

29278561 is a wasteful number, since it uses less digits than its factorization.

29278561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4115.

The product of its digits is 60480, while the sum is 40.

The square root of 29278561 is about 5410.9667343276. The cubic root of 29278561 is about 308.2122595169.

The spelling of 29278561 in words is "twenty-nine million, two hundred seventy-eight thousand, five hundred sixty-one".