81749762 has 8 divisors (see below), whose sum is σ = 122677500. Its totient is φ = 40857264.

The previous prime is 81749749. The next prime is 81749783. The reversal of 81749762 is 26794718.

It can be written as a sum of positive squares in 2 ways, for example, as 71757841 + 9991921 = 8471^2 + 3161^2 .

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

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, 1937 + ... + 12932.

Almost surely, 2^81749762 is an apocalyptic number.

81749762 is a deficient number, since it is larger than the sum of its proper divisors (40927738).

81749762 is a wasteful number, since it uses less digits than its factorization.

81749762 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17620.

The product of its digits is 169344, while the sum is 44.

The square root of 81749762 is about 9041.5574985729. The cubic root of 81749762 is about 434.0057656012.

The spelling of 81749762 in words is "eighty-one million, seven hundred forty-nine thousand, seven hundred sixty-two".