71649930 has 32 divisors (see below), whose sum is σ = 187593408. Its totient is φ = 17369600.

The previous prime is 71649901. The next prime is 71649947. The reversal of 71649930 is 3994617.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 108231 + ... + 108890.

It is an arithmetic number, because the mean of its divisors is an integer number (5862294).

Almost surely, 2^71649930 is an apocalyptic number.

71649930 is an abundant number, since it is smaller than the sum of its proper divisors (115943478).

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

71649930 is a wasteful number, since it uses less digits than its factorization.

71649930 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217142.

The product of its (nonzero) digits is 40824, while the sum is 39.

The square root of 71649930 is about 8464.6281666710. The cubic root of 71649930 is about 415.3414328593.

The spelling of 71649930 in words is "seventy-one million, six hundred forty-nine thousand, nine hundred thirty".