90464400781 has 2 divisors, whose sum is σ = 90464400782. Its totient is φ = 90464400780.

The previous prime is 90464400713. The next prime is 90464400877. The reversal of 90464400781 is 18700446409.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81876671881 + 8587728900 = 286141^2 + 92670^2 .

It is a cyclic number.

It is not a de Polignac number, because 90464400781 - 2²³ = 90456012173 is a prime.

It is a super-2 number, since 2×90464400781² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90464400181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45232200390 + 45232200391.

It is an arithmetic number, because the mean of its divisors is an integer number (45232200391).

Almost surely, 2^90464400781 is an apocalyptic number.

It is an amenable number.

90464400781 is a deficient number, since it is larger than the sum of its proper divisors (1).

90464400781 is an equidigital number, since it uses as much as digits as its factorization.

90464400781 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 43.

The spelling of 90464400781 in words is "ninety billion, four hundred sixty-four million, four hundred thousand, seven hundred eighty-one".