81054390 has 32 divisors (see below), whose sum is σ = 195780960. Its totient is φ = 21475584.

The previous prime is 81054373. The next prime is 81054401. The reversal of 81054390 is 9345018.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3895 + ... + 13314.

It is an arithmetic number, because the mean of its divisors is an integer number (6118155).

Almost surely, 2^81054390 is an apocalyptic number.

81054390 is an abundant number, since it is smaller than the sum of its proper divisors (114726570).

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

81054390 is a wasteful number, since it uses less digits than its factorization.

81054390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17376.

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 81054390 is about 9003.0211595886. The cubic root of 81054390 is about 432.7716938117.

The spelling of 81054390 in words is "eighty-one million, fifty-four thousand, three hundred ninety".