3081620 has 12 divisors (see below), whose sum is σ = 6471444. Its totient is φ = 1232640.

The previous prime is 3081599. The next prime is 3081643. The reversal of 3081620 is 261803.

It can be written as a sum of positive squares in 2 ways, for example, as 1607824 + 1473796 = 1268^2 + 1214^2 .

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 154081 = 3081620 / (3 + 0 + 8 + 1 + 6 + 2 + 0).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3081592 and 3081601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77021 + ... + 77060.

It is an arithmetic number, because the mean of its divisors is an integer number (539287).

Almost surely, 2^3081620 is an apocalyptic number.

It is an amenable number.

3081620 is an abundant number, since it is smaller than the sum of its proper divisors (3389824).

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

3081620 is a wasteful number, since it uses less digits than its factorization.

3081620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154090 (or 154088 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 3081620 is about 1755.4543571395. The cubic root of 3081620 is about 145.5212314959.

The spelling of 3081620 in words is "three million, eighty-one thousand, six hundred twenty".