81255470 has 8 divisors (see below), whose sum is σ = 146259864. Its totient is φ = 32502184.

The previous prime is 81255469. The next prime is 81255491. The reversal of 81255470 is 7455218.

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

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, 4062764 + ... + 4062783.

It is an arithmetic number, because the mean of its divisors is an integer number (18282483).

Almost surely, 2^81255470 is an apocalyptic number.

81255470 is a deficient number, since it is larger than the sum of its proper divisors (65004394).

81255470 is a wasteful number, since it uses less digits than its factorization.

81255470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8125554.

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 81255470 is about 9014.1816045607. The cubic root of 81255470 is about 433.1292720993.

The spelling of 81255470 in words is "eighty-one million, two hundred fifty-five thousand, four hundred seventy".