81540614 has 8 divisors (see below), whose sum is σ = 122351040. Its totient is φ = 40756936.

The previous prime is 81540601. The next prime is 81540617. The reversal of 81540614 is 41604518.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81540617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5072 + ... + 13740.

It is an arithmetic number, because the mean of its divisors is an integer number (15293880).

Almost surely, 2^81540614 is an apocalyptic number.

81540614 is a deficient number, since it is larger than the sum of its proper divisors (40810426).

81540614 is a wasteful number, since it uses less digits than its factorization.

81540614 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13374.

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 81540614 is about 9029.9841638842. The cubic root of 81540614 is about 433.6353304443.

The spelling of 81540614 in words is "eighty-one million, five hundred forty thousand, six hundred fourteen".