88005781 has 4 divisors (see below), whose sum is σ = 88994700. Its totient is φ = 87016864.

The previous prime is 88005767. The next prime is 88005823. The reversal of 88005781 is 18750088.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30625156 + 57380625 = 5534^2 + 7575^2 .

It is a cyclic number.

It is not a de Polignac number, because 88005781 - 2⁷ = 88005653 is a prime.

It is a super-2 number, since 2×88005781² = 15490034978839922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 88005781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (88005581) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 494326 + ... + 494503.

It is an arithmetic number, because the mean of its divisors is an integer number (22248675).

Almost surely, 2^88005781 is an apocalyptic number.

It is an amenable number.

88005781 is a deficient number, since it is larger than the sum of its proper divisors (988919).

88005781 is an equidigital number, since it uses as much as digits as its factorization.

88005781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 988918.

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 88005781 is about 9381.1396429219. The cubic root of 88005781 is about 444.8057579225.

The spelling of 88005781 in words is "eighty-eight million, five thousand, seven hundred eighty-one".