29928861 has 6 divisors (see below), whose sum is σ = 43230590. Its totient is φ = 19952568.

The previous prime is 29928859. The next prime is 29928869. The reversal of 29928861 is 16882992.

It can be written as a sum of positive squares in only one way, i.e., 25948836 + 3980025 = 5094^2 + 1995^2 .

It is not a de Polignac number, because 29928861 - 2¹ = 29928859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29928869) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1662706 + ... + 1662723.

Almost surely, 2^29928861 is an apocalyptic number.

It is an amenable number.

29928861 is a deficient number, since it is larger than the sum of its proper divisors (13301729).

29928861 is a wasteful number, since it uses less digits than its factorization.

29928861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3325435 (or 3325432 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 29928861 is about 5470.7276481287. The cubic root of 29928861 is about 310.4774501893.

The spelling of 29928861 in words is "twenty-nine million, nine hundred twenty-eight thousand, eight hundred sixty-one".