2581620492 has 48 divisors (see below), whose sum is σ = 6663976704. Its totient is φ = 771288000.

The previous prime is 2581620479. The next prime is 2581620521. The reversal of 2581620492 is 2940261852.

It is a self number, because there is not a number n which added to its sum of digits gives 2581620492.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 128359 + ... + 147102.

It is an arithmetic number, because the mean of its divisors is an integer number (138832848).

Almost surely, 2^2581620492 is an apocalyptic number.

2581620492 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

2581620492 is an abundant number, since it is smaller than the sum of its proper divisors (4082356212).

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

2581620492 is a wasteful number, since it uses less digits than its factorization.

2581620492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 275550 (or 275548 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 2581620492 is about 50809.6495953279. The cubic root of 2581620492 is about 1371.8210624075.

The spelling of 2581620492 in words is "two billion, five hundred eighty-one million, six hundred twenty thousand, four hundred ninety-two".