81253700 has 36 divisors (see below), whose sum is σ = 192352272. Its totient is φ = 29546400.

The previous prime is 81253681. The next prime is 81253729. The reversal of 81253700 is 735218.

It is a self number, because there is not a number n which added to its sum of digits gives 81253700.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35834 + ... + 38033.

Almost surely, 2^81253700 is an apocalyptic number.

It is an amenable number.

81253700 is an abundant number, since it is smaller than the sum of its proper divisors (111098572).

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

81253700 is a wasteful number, since it uses less digits than its factorization.

81253700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73892 (or 73885 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 81253700 is about 9014.0834253961. The cubic root of 81253700 is about 433.1261271034.

Adding to 81253700 its reverse (735218), we get a palindrome (81988918).

The spelling of 81253700 in words is "eighty-one million, two hundred fifty-three thousand, seven hundred".