81265356 has 120 divisors (see below), whose sum is σ = 229570880. Its totient is φ = 24984288.

The previous prime is 81265351. The next prime is 81265363. The reversal of 81265356 is 65356218.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 81265356.

It is not an unprimeable number, because it can be changed into a prime (81265351) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 264555 + ... + 264861.

Almost surely, 2^81265356 is an apocalyptic number.

81265356 is a gapful number since it is divisible by the number (86) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81265356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (114785440).

81265356 is an abundant number, since it is smaller than the sum of its proper divisors (148305524).

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

81265356 is a wasteful number, since it uses less digits than its factorization.

81265356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385 (or 374 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 81265356 is about 9014.7299460383. The cubic root of 81265356 is about 433.1468370392.

The spelling of 81265356 in words is "eighty-one million, two hundred sixty-five thousand, three hundred fifty-six".