81953470 has 8 divisors (see below), whose sum is σ = 147516264. Its totient is φ = 32781384.

The previous prime is 81953461. The next prime is 81953471. The reversal of 81953470 is 7435918.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81953471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4097664 + ... + 4097683.

It is an arithmetic number, because the mean of its divisors is an integer number (18439533).

Almost surely, 2^81953470 is an apocalyptic number.

81953470 is a deficient number, since it is larger than the sum of its proper divisors (65562794).

81953470 is a wasteful number, since it uses less digits than its factorization.

81953470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8195354.

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 81953470 is about 9052.8155841153. The cubic root of 81953470 is about 434.3659587511.

It can be divided in two parts, 819 and 53470, that added together give a square (54289 = 233²).

The spelling of 81953470 in words is "eighty-one million, nine hundred fifty-three thousand, four hundred seventy".