81455630 has 8 divisors (see below), whose sum is σ = 146620152. Its totient is φ = 32582248.

The previous prime is 81455623. The next prime is 81455651. The reversal of 81455630 is 3655418.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4072772 + ... + 4072791.

It is an arithmetic number, because the mean of its divisors is an integer number (18327519).

Almost surely, 2^81455630 is an apocalyptic number.

81455630 is a deficient number, since it is larger than the sum of its proper divisors (65164522).

81455630 is a wasteful number, since it uses less digits than its factorization.

81455630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8145570.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 81455630 is about 9025.2772810590. The cubic root of 81455630 is about 433.4846289582.

The spelling of 81455630 in words is "eighty-one million, four hundred fifty-five thousand, six hundred thirty".