2578156290 has 80 divisors (see below), whose sum is σ = 6996215160. Its totient is φ = 681177600.

The previous prime is 2578156271. The next prime is 2578156291. The reversal of 2578156290 is 926518752.

2578156290 is a `hidden beast` number, since 2 + 5 + 7 + 8 + 15 + 629 + 0 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2076351489 + 501804801 = 45567^2 + 22401^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (2578156291) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 73690 + ... + 102890.

Almost surely, 2^2578156290 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2578156290, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3498107580).

2578156290 is an abundant number, since it is smaller than the sum of its proper divisors (4418058870).

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

2578156290 is a wasteful number, since it uses less digits than its factorization.

2578156290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29329 (or 29320 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 45.

The square root of 2578156290 is about 50775.5481506601. The cubic root of 2578156290 is about 1371.2071853858.

The spelling of 2578156290 in words is "two billion, five hundred seventy-eight million, one hundred fifty-six thousand, two hundred ninety".