69420890781 has 32 divisors (see below), whose sum is σ = 112210243200. Its totient is φ = 42067693440.

The previous prime is 69420890779. The next prime is 69420890797. The reversal of 69420890781 is 18709802496.

69420890781 is a `hidden beast` number, since 69 + 420 + 8 + 90 + 78 + 1 = 666.

It is not a de Polignac number, because 69420890781 - 2¹ = 69420890779 is a prime.

It is a super-2 number, since 2×69420890781² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69420890711) 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 31 ways as a sum of consecutive naturals, for example, 3863025 + ... + 3880953.

It is an arithmetic number, because the mean of its divisors is an integer number (3506570100).

Almost surely, 2^69420890781 is an apocalyptic number.

It is an amenable number.

69420890781 is a deficient number, since it is larger than the sum of its proper divisors (42789352419).

69420890781 is a wasteful number, since it uses less digits than its factorization.

69420890781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30986 (or 30980 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The spelling of 69420890781 in words is "sixty-nine billion, four hundred twenty million, eight hundred ninety thousand, seven hundred eighty-one".