81655434 has 24 divisors (see below), whose sum is σ = 202194720. Its totient is φ = 23330088.

The previous prime is 81655429. The next prime is 81655439. The reversal of 81655434 is 43455618.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (81655429) and next prime (81655439).

It is a super-3 number, since 3×81655434³ (a number of 25 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81655439) 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, 323904 + ... + 324155.

It is an arithmetic number, because the mean of its divisors is an integer number (8424780).

Almost surely, 2^81655434 is an apocalyptic number.

81655434 is an abundant number, since it is smaller than the sum of its proper divisors (120539286).

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

81655434 is a wasteful number, since it uses less digits than its factorization.

81655434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 648074 (or 648071 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 81655434 is about 9036.3396350514. The cubic root of 81655434 is about 433.8387736699.

The spelling of 81655434 in words is "eighty-one million, six hundred fifty-five thousand, four hundred thirty-four".