81502768 has 10 divisors (see below), whose sum is σ = 157911644. Its totient is φ = 40751376.

The previous prime is 81502741. The next prime is 81502769. The reversal of 81502768 is 86720518.

It is not an unprimeable number, because it can be changed into a prime (81502769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2546946 + ... + 2546977.

Almost surely, 2^81502768 is an apocalyptic number.

It is an amenable number.

81502768 is a deficient number, since it is larger than the sum of its proper divisors (76408876).

81502768 is a wasteful number, since it uses less digits than its factorization.

81502768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5093931 (or 5093925 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 37.

The square root of 81502768 is about 9027.8883466733. Note that the first 3 decimals coincide. The cubic root of 81502768 is about 433.5682313566.

The spelling of 81502768 in words is "eighty-one million, five hundred two thousand, seven hundred sixty-eight".