29987668 has 6 divisors (see below), whose sum is σ = 52478426. Its totient is φ = 14993832.

The previous prime is 29987623. The next prime is 29987669. The reversal of 29987668 is 86678992.

It can be written as a sum of positive squares in only one way, i.e., 17960644 + 12027024 = 4238^2 + 3468^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (29987669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3748455 + ... + 3748462.

Almost surely, 2^29987668 is an apocalyptic number.

It is an amenable number.

29987668 is a deficient number, since it is larger than the sum of its proper divisors (22490758).

29987668 is a wasteful number, since it uses less digits than its factorization.

29987668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7496921 (or 7496919 counting only the distinct ones).

The product of its digits is 2612736, while the sum is 55.

The square root of 29987668 is about 5476.0997069082. The cubic root of 29987668 is about 310.6806687699.

The spelling of 29987668 in words is "twenty-nine million, nine hundred eighty-seven thousand, six hundred sixty-eight".