81754040 has 16 divisors (see below), whose sum is σ = 183946680. Its totient is φ = 32701600.

The previous prime is 81754027. The next prime is 81754097. The reversal of 81754040 is 4045718.

It is a junction number, because it is equal to n+sod(n) for n = 81753994 and 81754012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1021886 + ... + 1021965.

Almost surely, 2^81754040 is an apocalyptic number.

It is an amenable number.

81754040 is an abundant number, since it is smaller than the sum of its proper divisors (102192640).

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

81754040 is a wasteful number, since it uses less digits than its factorization.

81754040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2043862 (or 2043858 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 81754040 is about 9041.7940697629. The cubic root of 81754040 is about 434.0133360382.

Adding to 81754040 its reverse (4045718), we get a palindrome (85799758).

The spelling of 81754040 in words is "eighty-one million, seven hundred fifty-four thousand, forty".