81485788 has 6 divisors (see below), whose sum is σ = 142600136. Its totient is φ = 40742892.

The previous prime is 81485773. The next prime is 81485797. The reversal of 81485788 is 88758418.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10185720 + ... + 10185727.

Almost surely, 2^81485788 is an apocalyptic number.

It is an amenable number.

81485788 is a deficient number, since it is larger than the sum of its proper divisors (61114348).

81485788 is a wasteful number, since it uses less digits than its factorization.

81485788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20371451 (or 20371449 counting only the distinct ones).

The product of its digits is 573440, while the sum is 49.

The square root of 81485788 is about 9026.9478784360. The cubic root of 81485788 is about 433.5381199054.

The spelling of 81485788 in words is "eighty-one million, four hundred eighty-five thousand, seven hundred eighty-eight".