90414642781 has 4 divisors (see below), whose sum is σ = 90563596672. Its totient is φ = 90265688892.

The previous prime is 90414642761. The next prime is 90414642793. The reversal of 90414642781 is 18724641409.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18724641409 = 109 ⋅171785701.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90414642781 is a prime.

It is a super-2 number, since 2×90414642781² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90414642751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74476035 + ... + 74477248.

It is an arithmetic number, because the mean of its divisors is an integer number (22640899168).

Almost surely, 2^90414642781 is an apocalyptic number.

It is an amenable number.

90414642781 is a deficient number, since it is larger than the sum of its proper divisors (148953891).

90414642781 is a wasteful number, since it uses less digits than its factorization.

90414642781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148953890.

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 90414642781 in words is "ninety billion, four hundred fourteen million, six hundred forty-two thousand, seven hundred eighty-one".