81264016 has 40 divisors (see below), whose sum is σ = 160373664. Its totient is φ = 39886080.

The previous prime is 81263993. The next prime is 81264019. The reversal of 81264016 is 61046218.

It is not an unprimeable number, because it can be changed into a prime (81264019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287011 + ... + 287293.

Almost surely, 2^81264016 is an apocalyptic number.

It is an amenable number.

81264016 is a deficient number, since it is larger than the sum of its proper divisors (79109648).

81264016 is a wasteful number, since it uses less digits than its factorization.

81264016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 559 (or 553 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 81264016 is about 9014.6556229287. The cubic root of 81264016 is about 433.1444562791.

The spelling of 81264016 in words is "eighty-one million, two hundred sixty-four thousand, sixteen".