763421781640 has 128 divisors (see below), whose sum is σ = 2013220800000. Its totient is φ = 260428379904.

The previous prime is 763421781581. The next prime is 763421781721. The reversal of 763421781640 is 46187124367.

It is a Harshad number since it is a multiple of its sum of digits (49).

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, 2590474 + ... + 2870086.

It is an arithmetic number, because the mean of its divisors is an integer number (15728287500).

Almost surely, 2^763421781640 is an apocalyptic number.

763421781640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 763421781640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1006610400000).

763421781640 is an abundant number, since it is smaller than the sum of its proper divisors (1249799018360).

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

763421781640 is a wasteful number, since it uses less digits than its factorization.

763421781640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279844 (or 279826 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 49.

The spelling of 763421781640 in words is "seven hundred sixty-three billion, four hundred twenty-one million, seven hundred eighty-one thousand, six hundred forty".