81617454 has 24 divisors (see below), whose sum is σ = 178192872. Its totient is φ = 26997360.

The previous prime is 81617453. The next prime is 81617467. The reversal of 81617454 is 45471618.

It is a happy number.

It is a super-2 number, since 2×81617454² = 13322817594884232, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81617453) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14949 + ... + 19664.

It is an arithmetic number, because the mean of its divisors is an integer number (7424703).

Almost surely, 2^81617454 is an apocalyptic number.

81617454 is an abundant number, since it is smaller than the sum of its proper divisors (96575418).

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

81617454 is a wasteful number, since it uses less digits than its factorization.

81617454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34752 (or 34749 counting only the distinct ones).

The product of its digits is 26880, while the sum is 36.

The square root of 81617454 is about 9034.2378759915. The cubic root of 81617454 is about 433.7715001233.

The spelling of 81617454 in words is "eighty-one million, six hundred seventeen thousand, four hundred fifty-four".