1280005620 has 48 divisors (see below), whose sum is σ = 3589454400. Its totient is φ = 340816896.

The previous prime is 1280005613. The next prime is 1280005627. The reversal of 1280005620 is 265000821.

It is an interprime number because it is at equal distance from previous prime (1280005613) and next prime (1280005627).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1280005627) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24531 + ... + 56229.

It is an arithmetic number, because the mean of its divisors is an integer number (74780300).

Almost surely, 2^1280005620 is an apocalyptic number.

1280005620 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1280005620 is an abundant number, since it is smaller than the sum of its proper divisors (2309448780).

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

1280005620 is a wasteful number, since it uses less digits than its factorization.

1280005620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32384 (or 32382 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 24.

The square root of 1280005620 is about 35777.1661817981. The cubic root of 1280005620 is about 1085.7686357010.

The spelling of 1280005620 in words is "one billion, two hundred eighty million, five thousand, six hundred twenty".