81649060 has 24 divisors (see below), whose sum is σ = 172428480. Its totient is φ = 32475744.

The previous prime is 81649021. The next prime is 81649069. The reversal of 81649060 is 6094618.

It is not an unprimeable number, because it can be changed into a prime (81649069) 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, 7824 + ... + 14983.

It is an arithmetic number, because the mean of its divisors is an integer number (7184520).

Almost surely, 2^81649060 is an apocalyptic number.

It is an amenable number.

81649060 is an abundant number, since it is smaller than the sum of its proper divisors (90779420).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81649060 is a wasteful number, since it uses less digits than its factorization.

81649060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22995 (or 22993 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 81649060 is about 9035.9869411150. The cubic root of 81649060 is about 433.8274849323.

The spelling of 81649060 in words is "eighty-one million, six hundred forty-nine thousand, sixty".