1025640002 has 4 divisors (see below), whose sum is σ = 1538460006. Its totient is φ = 512820000.

The previous prime is 1025640001. The next prime is 1025640017. The reversal of 1025640002 is 2000465201.

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., 901740841 + 123899161 = 30029^2 + 11131^2 .

It is not an unprimeable number, because it can be changed into a prime (1025640001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 256409999 + ... + 256410002.

Almost surely, 2^1025640002 is an apocalyptic number.

1025640002 is a deficient number, since it is larger than the sum of its proper divisors (512820004).

1025640002 is an equidigital number, since it uses as much as digits as its factorization.

1025640002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512820003.

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 1025640002 is about 32025.6147794230. The cubic root of 1025640002 is about 1008.4746448462.

The spelling of 1025640002 in words is "one billion, twenty-five million, six hundred forty thousand, two".