81253324 has 12 divisors (see below), whose sum is σ = 142735824. Its totient is φ = 40471664.

The previous prime is 81253321. The next prime is 81253327. The reversal of 81253324 is 42335218.

It is an interprime number because it is at equal distance from previous prime (81253321) and next prime (81253327).

It is a super-2 number, since 2×81253324² = 13204205322097952, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81253292 and 81253301.

It is not an unprimeable number, because it can be changed into a prime (81253321) 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, 37567 + ... + 39670.

It is an arithmetic number, because the mean of its divisors is an integer number (11894652).

Almost surely, 2^81253324 is an apocalyptic number.

It is an amenable number.

81253324 is a deficient number, since it is larger than the sum of its proper divisors (61482500).

81253324 is a wasteful number, since it uses less digits than its factorization.

81253324 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77504 (or 77502 counting only the distinct ones).

The product of its digits is 5760, while the sum is 28.

The square root of 81253324 is about 9014.0625691194. The cubic root of 81253324 is about 433.1254590079.

It can be divided in two parts, 8125 and 3324, that added together give a square (11449 = 107²).

The spelling of 81253324 in words is "eighty-one million, two hundred fifty-three thousand, three hundred twenty-four".