81490016 has 12 divisors (see below), whose sum is σ = 160433532. Its totient is φ = 40744992.

The previous prime is 81490009. The next prime is 81490043. The reversal of 81490016 is 61009418.

It is a super-3 number, since 3×81490016³ (a number of 25 digits) contains 333 as substring.

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, 1273250 + ... + 1273313.

It is an arithmetic number, because the mean of its divisors is an integer number (13369461).

Almost surely, 2^81490016 is an apocalyptic number.

It is an amenable number.

81490016 is a deficient number, since it is larger than the sum of its proper divisors (78943516).

81490016 is a wasteful number, since it uses less digits than its factorization.

81490016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2546573 (or 2546565 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 81490016 is about 9027.1820630804. The cubic root of 81490016 is about 433.5456180123.

The spelling of 81490016 in words is "eighty-one million, four hundred ninety thousand, sixteen".