81838754 has 8 divisors (see below), whose sum is σ = 126991260. Its totient is φ = 39508336.

The previous prime is 81838751. The next prime is 81838763. The reversal of 81838754 is 45783818.

It can be written as a sum of positive squares in 2 ways, for example, as 81450625 + 388129 = 9025^2 + 623^2 .

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

It is not an unprimeable number, because it can be changed into a prime (81838751) 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, 705449 + ... + 705564.

Almost surely, 2^81838754 is an apocalyptic number.

81838754 is a deficient number, since it is larger than the sum of its proper divisors (45152506).

81838754 is a wasteful number, since it uses less digits than its factorization.

81838754 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411044.

The product of its digits is 215040, while the sum is 44.

The square root of 81838754 is about 9046.4774359968. The cubic root of 81838754 is about 434.1631933161.

The spelling of 81838754 in words is "eighty-one million, eight hundred thirty-eight thousand, seven hundred fifty-four".