81400654 has 8 divisors (see below), whose sum is σ = 123360048. Its totient is φ = 40280640.

The previous prime is 81400603. The next prime is 81400661. The reversal of 81400654 is 45600418.

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 pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 209602 + ... + 209989.

It is an arithmetic number, because the mean of its divisors is an integer number (15420006).

Almost surely, 2^81400654 is an apocalyptic number.

81400654 is a deficient number, since it is larger than the sum of its proper divisors (41959394).

81400654 is a wasteful number, since it uses less digits than its factorization.

81400654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419690.

The product of its (nonzero) digits is 3840, while the sum is 28.

The square root of 81400654 is about 9022.2310987915. The cubic root of 81400654 is about 433.3870845881.

The spelling of 81400654 in words is "eighty-one million, four hundred thousand, six hundred fifty-four".