2609778 has 8 divisors (see below), whose sum is σ = 5219568. Its totient is φ = 869924.

The previous prime is 2609777. The next prime is 2609791. The reversal of 2609778 is 8779062.

It is a sphenic number, since it is the product of 3 distinct primes.

2609778 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (2609777) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 217476 + ... + 217487.

It is an arithmetic number, because the mean of its divisors is an integer number (652446).

2^2609778 is an apocalyptic number.

2609778 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2609778 is a wasteful number, since it uses less digits than its factorization.

2609778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434968.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 2609778 is about 1615.4807334041. The cubic root of 2609778 is about 137.6790482903.

The spelling of 2609778 in words is "two million, six hundred nine thousand, seven hundred seventy-eight".