81286974 has 12 divisors (see below), whose sum is σ = 176121816. Its totient is φ = 27095652.

The previous prime is 81286973. The next prime is 81287009. The reversal of 81286974 is 47968218.

It is a super-3 number, since 3×81286974³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81286973) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2257954 + ... + 2257989.

It is an arithmetic number, because the mean of its divisors is an integer number (14676818).

Almost surely, 2^81286974 is an apocalyptic number.

81286974 is an abundant number, since it is smaller than the sum of its proper divisors (94834842).

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

81286974 is a wasteful number, since it uses less digits than its factorization.

81286974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4515951 (or 4515948 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 81286974 is about 9015.9289038900. The cubic root of 81286974 is about 433.1852418347.

The spelling of 81286974 in words is "eighty-one million, two hundred eighty-six thousand, nine hundred seventy-four".