2591391420 has 96 divisors (see below), whose sum is σ = 8140554240. Its totient is φ = 684313920.

The previous prime is 2591391419. The next prime is 2591391457. The reversal of 2591391420 is 241931952.

2591391420 is a `hidden beast` number, since 2 + 591 + 39 + 14 + 20 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32325 + ... + 78915.

It is an arithmetic number, because the mean of its divisors is an integer number (84797440).

Almost surely, 2^2591391420 is an apocalyptic number.

2591391420 is a gapful number since it is divisible by the number (20) 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 2591391420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4070277120).

2591391420 is an abundant number, since it is smaller than the sum of its proper divisors (5549162820).

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

2591391420 is a wasteful number, since it uses less digits than its factorization.

2591391420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46712 (or 46704 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 36.

The square root of 2591391420 is about 50905.7110744954. The cubic root of 2591391420 is about 1373.5495749030.

The spelling of 2591391420 in words is "two billion, five hundred ninety-one million, three hundred ninety-one thousand, four hundred twenty".