29678661 has 24 divisors (see below), whose sum is σ = 43867200. Its totient is φ = 19331136.

The previous prime is 29678657. The next prime is 29678689. The reversal of 29678661 is 16687692.

It is not a de Polignac number, because 29678661 - 2² = 29678657 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29678161) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 130630 + ... + 130856.

It is an arithmetic number, because the mean of its divisors is an integer number (1827800).

Almost surely, 2^29678661 is an apocalyptic number.

It is an amenable number.

29678661 is a deficient number, since it is larger than the sum of its proper divisors (14188539).

29678661 is a wasteful number, since it uses less digits than its factorization.

29678661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 505 (or 502 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 29678661 is about 5447.8124967734. The cubic root of 29678661 is about 309.6098491048.

It can be divided in two parts, 2967 and 8661, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 29678661 in words is "twenty-nine million, six hundred seventy-eight thousand, six hundred sixty-one".