81763474 has 8 divisors (see below), whose sum is σ = 132079500. Its totient is φ = 37736976.

The previous prime is 81763469. The next prime is 81763477. The reversal of 81763474 is 47436718.

It can be written as a sum of positive squares in 2 ways, for example, as 65723449 + 16040025 = 8107^2 + 4005^2 .

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 (81763477) 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, 1572349 + ... + 1572400.

Almost surely, 2^81763474 is an apocalyptic number.

81763474 is a deficient number, since it is larger than the sum of its proper divisors (50316026).

81763474 is a wasteful number, since it uses less digits than its factorization.

81763474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3144764.

The product of its digits is 112896, while the sum is 40.

The square root of 81763474 is about 9042.3157432153. The cubic root of 81763474 is about 434.0300297059.

The spelling of 81763474 in words is "eighty-one million, seven hundred sixty-three thousand, four hundred seventy-four".