81007296 has 28 divisors (see below), whose sum is σ = 214332312. Its totient is φ = 27002368.

The previous prime is 81007291. The next prime is 81007307. The reversal of 81007296 is 69270018.

It is not an unprimeable number, because it can be changed into a prime (81007291) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210765 + ... + 211148.

Almost surely, 2^81007296 is an apocalyptic number.

It is an amenable number.

81007296 is an abundant number, since it is smaller than the sum of its proper divisors (133325016).

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

81007296 is a wasteful number, since it uses less digits than its factorization.

81007296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 421928 (or 421918 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 33.

The square root of 81007296 is about 9000.4053242062. The cubic root of 81007296 is about 432.6878616317.

The spelling of 81007296 in words is "eighty-one million, seven thousand, two hundred ninety-six".