2620985391 has 32 divisors (see below), whose sum is σ = 3993520320. Its totient is φ = 1697697792.

The previous prime is 2620985383. The next prime is 2620985399. The reversal of 2620985391 is 1935890262.

2620985391 is a `hidden beast` number, since 2 + 6 + 20 + 98 + 539 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (2620985383) and next prime (2620985399).

It is not a de Polignac number, because 2620985391 - 2³ = 2620985383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2620985399) 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, 950671 + ... + 953423.

It is an arithmetic number, because the mean of its divisors is an integer number (124797510).

Almost surely, 2^2620985391 is an apocalyptic number.

2620985391 is a deficient number, since it is larger than the sum of its proper divisors (1372534929).

2620985391 is a wasteful number, since it uses less digits than its factorization.

2620985391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3752 (or 3746 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The square root of 2620985391 is about 51195.5602664919. The cubic root of 2620985391 is about 1378.7584911693.

The spelling of 2620985391 in words is "two billion, six hundred twenty million, nine hundred eighty-five thousand, three hundred ninety-one".