88905781 has 2 divisors, whose sum is σ = 88905782. Its totient is φ = 88905780.

The previous prime is 88905779. The next prime is 88905821. The reversal of 88905781 is 18750988.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 87123556 + 1782225 = 9334^2 + 1335^2 .

It is a cyclic number.

It is not a de Polignac number, because 88905781 - 2¹ = 88905779 is a prime.

It is a super-2 number, since 2×88905781² = 15808475790439922, which contains 22 as substring.

Together with 88905779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (88905721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 44452890 + 44452891.

It is an arithmetic number, because the mean of its divisors is an integer number (44452891).

Almost surely, 2^88905781 is an apocalyptic number.

It is an amenable number.

88905781 is a deficient number, since it is larger than the sum of its proper divisors (1).

88905781 is an equidigital number, since it uses as much as digits as its factorization.

88905781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 46.

The square root of 88905781 is about 9428.9862127378. The cubic root of 88905781 is about 446.3169019369.

The spelling of 88905781 in words is "eighty-eight million, nine hundred five thousand, seven hundred eighty-one".