81629415 has 96 divisors (see below), whose sum is σ = 177914880. Its totient is φ = 33758208.

The previous prime is 81629413. The next prime is 81629419. The reversal of 81629415 is 51492618.

It is not a de Polignac number, because 81629415 - 2¹ = 81629413 is a prime.

It is a super-2 number, since 2×81629415² = 13326722786484450, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 81629415.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81629411) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 137359 + ... + 137951.

It is an arithmetic number, because the mean of its divisors is an integer number (1853280).

Almost surely, 2^81629415 is an apocalyptic number.

81629415 is an abundant number, since it is smaller than the sum of its proper divisors (96285465).

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

81629415 is a wasteful number, since it uses less digits than its factorization.

81629415 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653 (or 650 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 81629415 is about 9034.8998334237. The cubic root of 81629415 is about 433.7926887589.

The spelling of 81629415 in words is "eighty-one million, six hundred twenty-nine thousand, four hundred fifteen".