2578781064 has 32 divisors (see below), whose sum is σ = 6535271520. Its totient is φ = 847817856.

The previous prime is 2578781057. The next prime is 2578781069. The reversal of 2578781064 is 4601878752.

It is a super-2 number, since 2×2578781064² = 13300223552089944192, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (2578781069) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 734202 + ... + 737705.

It is an arithmetic number, because the mean of its divisors is an integer number (204227235).

Almost surely, 2^2578781064 is an apocalyptic number.

2578781064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2578781064 is an abundant number, since it is smaller than the sum of its proper divisors (3956490456).

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

2578781064 is a wasteful number, since it uses less digits than its factorization.

2578781064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1471989 (or 1471985 counting only the distinct ones).

The product of its (nonzero) digits is 752640, while the sum is 48.

The square root of 2578781064 is about 50781.7000896977. The cubic root of 2578781064 is about 1371.3179396496.

The spelling of 2578781064 in words is "two billion, five hundred seventy-eight million, seven hundred eighty-one thousand, sixty-four".