1280820600 has 120 divisors (see below), whose sum is σ = 4448535960. Its totient is φ = 341547840.

The previous prime is 1280820581. The next prime is 1280820659. The reversal of 1280820600 is 60280821.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 23332 + ... + 55731.

It is an arithmetic number, because the mean of its divisors is an integer number (37071133).

Almost surely, 2^1280820600 is an apocalyptic number.

1280820600 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280820600 is an abundant number, since it is smaller than the sum of its proper divisors (3167715360).

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

1280820600 is a wasteful number, since it uses less digits than its factorization.

1280820600 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79091 (or 79073 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 1280820600 is about 35788.5540361720. The cubic root of 1280820600 is about 1085.9990232280. Note that the first 3 decimals are identical.

The spelling of 1280820600 in words is "one billion, two hundred eighty million, eight hundred twenty thousand, six hundred".