81057450 has 24 divisors (see below), whose sum is σ = 201022848. Its totient is φ = 21615280.

The previous prime is 81057443. The next prime is 81057461. The reversal of 81057450 is 5475018.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 270042 + ... + 270341.

It is an arithmetic number, because the mean of its divisors is an integer number (8375952).

Almost surely, 2^81057450 is an apocalyptic number.

81057450 is an abundant number, since it is smaller than the sum of its proper divisors (119965398).

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

81057450 is a wasteful number, since it uses less digits than its factorization.

81057450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 540398 (or 540393 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 81057450 is about 9003.1911009375. The cubic root of 81057450 is about 432.7771398039. Note that the first 3 decimals are identical.

The spelling of 81057450 in words is "eighty-one million, fifty-seven thousand, four hundred fifty".