81154832 has 40 divisors (see below), whose sum is σ = 172355040. Its totient is φ = 36711680.

The previous prime is 81154831. The next prime is 81154837. The reversal of 81154832 is 23845118.

It is a super-2 number, since 2×81154832² = 13172213513896448, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (81154831) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40019 + ... + 41997.

It is an arithmetic number, because the mean of its divisors is an integer number (4308876).

Almost surely, 2^81154832 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 81154832, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86177520).

81154832 is an abundant number, since it is smaller than the sum of its proper divisors (91200208).

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

81154832 is a wasteful number, since it uses less digits than its factorization.

81154832 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2231 (or 2225 counting only the distinct ones).

The product of its digits is 7680, while the sum is 32.

The square root of 81154832 is about 9008.5976711140. The cubic root of 81154832 is about 432.9503825151.

The spelling of 81154832 in words is "eighty-one million, one hundred fifty-four thousand, eight hundred thirty-two".