2642578 has 4 divisors (see below), whose sum is σ = 3963870. Its totient is φ = 1321288.

The previous prime is 2642569. The next prime is 2642587. The reversal of 2642578 is 8752462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8752462 = 2 ⋅4376231.

It is an interprime number because it is at equal distance from previous prime (2642569) and next prime (2642587).

It can be written as a sum of positive squares in only one way, i.e., 2614689 + 27889 = 1617^2 + 167^2 .

It is a d-powerful number, because it can be written as 2¹⁸ + 6⁷ + 4⁴ + 2²¹ + 5⁴ + 7⁴ + 8² .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660643 + ... + 660646.

2^2642578 is an apocalyptic number.

2642578 is a deficient number, since it is larger than the sum of its proper divisors (1321292).

2642578 is a wasteful number, since it uses less digits than its factorization.

2642578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1321291.

The product of its digits is 26880, while the sum is 34.

The square root of 2642578 is about 1625.6008120077. The cubic root of 2642578 is about 138.2534375177.

The spelling of 2642578 in words is "two million, six hundred forty-two thousand, five hundred seventy-eight".