81698754 has 16 divisors (see below), whose sum is σ = 163525248. Its totient is φ = 27211632.

The previous prime is 81698741. The next prime is 81698761. The reversal of 81698754 is 45789618.

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, 4344 + ... + 13500.

It is an arithmetic number, because the mean of its divisors is an integer number (10220328).

Almost surely, 2^81698754 is an apocalyptic number.

81698754 is an abundant number, since it is smaller than the sum of its proper divisors (81826494).

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

81698754 is a wasteful number, since it uses less digits than its factorization.

81698754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10649.

The product of its digits is 483840, while the sum is 48.

The square root of 81698754 is about 9038.7363054799. The cubic root of 81698754 is about 433.9154804372.

The spelling of 81698754 in words is "eighty-one million, six hundred ninety-eight thousand, seven hundred fifty-four".