81629630 has 16 divisors (see below), whose sum is σ = 147074400. Its totient is φ = 32620512.

The previous prime is 81629629. The next prime is 81629633. The reversal of 81629630 is 3692618.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81629633) 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, 9071 + ... + 15669.

It is an arithmetic number, because the mean of its divisors is an integer number (9192150).

Almost surely, 2^81629630 is an apocalyptic number.

81629630 is a deficient number, since it is larger than the sum of its proper divisors (65444770).

81629630 is a wasteful number, since it uses less digits than its factorization.

81629630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7843.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 81629630 is about 9034.9117317216. The cubic root of 81629630 is about 433.7930696075.

The spelling of 81629630 in words is "eighty-one million, six hundred twenty-nine thousand, six hundred thirty".