81434632 has 32 divisors (see below), whose sum is σ = 159508800. Its totient is φ = 38937024.

The previous prime is 81434611. The next prime is 81434653. The reversal of 81434632 is 23643418.

It is an interprime number because it is at equal distance from previous prime (81434611) and next prime (81434653).

It is a junction number, because it is equal to n+sod(n) for n = 81434594 and 81434603.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15133 + ... + 19795.

It is an arithmetic number, because the mean of its divisors is an integer number (4984650).

Almost surely, 2^81434632 is an apocalyptic number.

It is an amenable number.

81434632 is a deficient number, since it is larger than the sum of its proper divisors (78074168).

81434632 is a wasteful number, since it uses less digits than its factorization.

81434632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4765 (or 4761 counting only the distinct ones).

The product of its digits is 13824, while the sum is 31.

The square root of 81434632 is about 9024.1139177207. The cubic root of 81434632 is about 433.4473772156.

The spelling of 81434632 in words is "eighty-one million, four hundred thirty-four thousand, six hundred thirty-two".