81453390 has 16 divisors (see below), whose sum is σ = 195488208. Its totient is φ = 21720896.

The previous prime is 81453389. The next prime is 81453433. The reversal of 81453390 is 9335418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1357527 + ... + 1357586.

It is an arithmetic number, because the mean of its divisors is an integer number (12218013).

Almost surely, 2^81453390 is an apocalyptic number.

81453390 is an abundant number, since it is smaller than the sum of its proper divisors (114034818).

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

81453390 is a wasteful number, since it uses less digits than its factorization.

81453390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2715123.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 81453390 is about 9025.1531842955. The cubic root of 81453390 is about 433.4806553656.

The spelling of 81453390 in words is "eighty-one million, four hundred fifty-three thousand, three hundred ninety".