81804270 has 16 divisors (see below), whose sum is σ = 196330320. Its totient is φ = 21814464.

The previous prime is 81804269. The next prime is 81804287. The reversal of 81804270 is 7240818.

It is a Harshad number since it is a multiple of its sum of digits (30), and also a Moran number because the ratio is a prime number: 2726809 = 81804270 / (8 + 1 + 8 + 0 + 4 + 2 + 7 + 0).

It is a Curzon number.

It is a congruent number.

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, 1363375 + ... + 1363434.

It is an arithmetic number, because the mean of its divisors is an integer number (12270645).

Almost surely, 2^81804270 is an apocalyptic number.

81804270 is an abundant number, since it is smaller than the sum of its proper divisors (114526050).

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

81804270 is a wasteful number, since it uses less digits than its factorization.

81804270 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2726819.

The product of its (nonzero) digits is 3584, while the sum is 30.

The square root of 81804270 is about 9044.5712999567. The cubic root of 81804270 is about 434.1022043340.

The spelling of 81804270 in words is "eighty-one million, eight hundred four thousand, two hundred seventy".