2758664 has 16 divisors (see below), whose sum is σ = 5258220. Its totient is φ = 1356480.

The previous prime is 2758661. The next prime is 2758711. The reversal of 2758664 is 4668572.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2696164 + 62500 = 1642^2 + 250^2 .

It is a super-2 number, since 2×2758664² = 15220454129792, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2¹⁹ + 7 + 5⁹ + 8 + 6⁴ + 6⁷ + 4 .

It is not an unprimeable number, because it can be changed into a prime (2758661) 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, 2339 + ... + 3314.

2^2758664 is an apocalyptic number.

It is an amenable number.

2758664 is a deficient number, since it is larger than the sum of its proper divisors (2499556).

2758664 is a wasteful number, since it uses less digits than its factorization.

2758664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5720 (or 5716 counting only the distinct ones).

The product of its digits is 80640, while the sum is 38.

The square root of 2758664 is about 1660.9226351640. The cubic root of 2758664 is about 140.2489448247.

The spelling of 2758664 in words is "two million, seven hundred fifty-eight thousand, six hundred sixty-four".