781222140198420 has 96 divisors (see below), whose sum is σ = 2220080743913088. Its totient is φ = 205215576648192.

The previous prime is 781222140198389. The next prime is 781222140198463. The reversal of 781222140198420 is 24891041222187.

It is a super-2 number, since 2×781222140198420² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1260350094 + ... + 1260969786.

It is an arithmetic number, because the mean of its divisors is an integer number (23125841082428).

Almost surely, 2^{781222140198420} is an apocalyptic number.

It is an amenable number.

781222140198420 is an abundant number, since it is smaller than the sum of its proper divisors (1438858603714668).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

781222140198420 is a wasteful number, since it uses less digits than its factorization.

781222140198420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 933369 (or 933367 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 51.

The spelling of 781222140198420 in words is "seven hundred eighty-one trillion, two hundred twenty-two billion, one hundred forty million, one hundred ninety-eight thousand, four hundred twenty".