1373656780 has 96 divisors (see below), whose sum is σ = 3168377856. Its totient is φ = 498195456.

The previous prime is 1373656771. The next prime is 1373656789. The reversal of 1373656780 is 876563731.

It is an interprime number because it is at equal distance from previous prime (1373656771) and next prime (1373656789).

It is a self number, because there is not a number n which added to its sum of digits gives 1373656780.

It is not an unprimeable number, because it can be changed into a prime (1373656789) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1070019 + ... + 1071301.

It is an arithmetic number, because the mean of its divisors is an integer number (33003936).

Almost surely, 2^1373656780 is an apocalyptic number.

1373656780 is a gapful number since it is divisible by the number (10) 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 1373656780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1584188928).

1373656780 is an abundant number, since it is smaller than the sum of its proper divisors (1794721076).

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

1373656780 is a wasteful number, since it uses less digits than its factorization.

1373656780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1423 (or 1421 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 46.

The square root of 1373656780 is about 37062.8760351919. The cubic root of 1373656780 is about 1111.6278310040.

The spelling of 1373656780 in words is "one billion, three hundred seventy-three million, six hundred fifty-six thousand, seven hundred eighty".