29661990 has 16 divisors (see below), whose sum is σ = 71188848. Its totient is φ = 7909856.

The previous prime is 29661979. The next prime is 29661997. The reversal of 29661990 is 9916692.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29661997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 494337 + ... + 494396.

It is an arithmetic number, because the mean of its divisors is an integer number (4449303).

Almost surely, 2^29661990 is an apocalyptic number.

29661990 is an abundant number, since it is smaller than the sum of its proper divisors (41526858).

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

29661990 is a wasteful number, since it uses less digits than its factorization.

29661990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988743.

The product of its (nonzero) digits is 52488, while the sum is 42.

The square root of 29661990 is about 5446.2822181742. The cubic root of 29661990 is about 309.5518672377.

The spelling of 29661990 in words is "twenty-nine million, six hundred sixty-one thousand, nine hundred ninety".