29691990 has 48 divisors (see below), whose sum is σ = 77686128. Its totient is φ = 7867968.

The previous prime is 29691989. The next prime is 29692001. The reversal of 29691990 is 9919692.

It is a happy number.

It is a super-2 number, since 2×29691990² = 1763228540320200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14617 + ... + 16523.

It is an arithmetic number, because the mean of its divisors is an integer number (1618461).

Almost surely, 2^29691990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 29691990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38843064).

29691990 is an abundant number, since it is smaller than the sum of its proper divisors (47994138).

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

29691990 is a wasteful number, since it uses less digits than its factorization.

29691990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2093 (or 2090 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 29691990 is about 5449.0356945060. The cubic root of 29691990 is about 309.6561918518.

The spelling of 29691990 in words is "twenty-nine million, six hundred ninety-one thousand, nine hundred ninety".