81177260 has 48 divisors (see below), whose sum is σ = 176415456. Its totient is φ = 31352832.

The previous prime is 81177259. The next prime is 81177269. The reversal of 81177260 is 6277118.

It is a super-2 number, since 2×81177260² = 13179495082215200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81177269) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 120284 + ... + 120956.

It is an arithmetic number, because the mean of its divisors is an integer number (3675322).

Almost surely, 2^81177260 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81177260, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88207728).

81177260 is an abundant number, since it is smaller than the sum of its proper divisors (95238196).

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

81177260 is a wasteful number, since it uses less digits than its factorization.

81177260 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 882 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 32.

The square root of 81177260 is about 9009.8423959579. The cubic root of 81177260 is about 432.9902623209.

The spelling of 81177260 in words is "eighty-one million, one hundred seventy-seven thousand, two hundred sixty".