2563642 has 4 divisors (see below), whose sum is σ = 3845466. Its totient is φ = 1281820.

The previous prime is 2563633. The next prime is 2563643. The reversal of 2563642 is 2463652.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 2563201 + 441 = 1601^2 + 21^2 .

It is a d-powerful number, because it can be written as 2²⁰ + 5⁸ + 6³ + 3¹⁰ + 6³ + 4⁷ + 2²⁰ .

It is a self number, because there is not a number n which added to its sum of digits gives 2563642.

It is not an unprimeable number, because it can be changed into a prime (2563643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 640909 + ... + 640912.

2^2563642 is an apocalyptic number.

2563642 is a deficient number, since it is larger than the sum of its proper divisors (1281824).

2563642 is a wasteful number, since it uses less digits than its factorization.

2563642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1281823.

The product of its digits is 8640, while the sum is 28.

The square root of 2563642 is about 1601.1377204975. The cubic root of 2563642 is about 136.8629172073.

The spelling of 2563642 in words is "two million, five hundred sixty-three thousand, six hundred forty-two".