81735755 has 8 divisors (see below), whose sum is σ = 100475424. Its totient is φ = 63793600.

The previous prime is 81735749. The next prime is 81735757. The reversal of 81735755 is 55753718.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-81735755 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81735757) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 199151 + ... + 199560.

It is an arithmetic number, because the mean of its divisors is an integer number (12559428).

Almost surely, 2^81735755 is an apocalyptic number.

81735755 is a deficient number, since it is larger than the sum of its proper divisors (18739669).

81735755 is a wasteful number, since it uses less digits than its factorization.

81735755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398757.

The product of its digits is 147000, while the sum is 41.

The square root of 81735755 is about 9040.7828753930. The cubic root of 81735755 is about 433.9809766768.

The spelling of 81735755 in words is "eighty-one million, seven hundred thirty-five thousand, seven hundred fifty-five".