670263644 has 12 divisors (see below), whose sum is σ = 1177997184. Its totient is φ = 333693024.

The previous prime is 670263637. The next prime is 670263647. The reversal of 670263644 is 446362076.

It is a junction number, because it is equal to n+sod(n) for n = 670263598 and 670263607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670263647) 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, 358652 + ... + 360515.

It is an arithmetic number, because the mean of its divisors is an integer number (98166432).

Almost surely, 2^670263644 is an apocalyptic number.

It is an amenable number.

670263644 is a deficient number, since it is larger than the sum of its proper divisors (507733540).

670263644 is a wasteful number, since it uses less digits than its factorization.

670263644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 719404 (or 719402 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 38.

The square root of 670263644 is about 25889.4504383542. The cubic root of 670263644 is about 875.1487720913.

The spelling of 670263644 in words is "six hundred seventy million, two hundred sixty-three thousand, six hundred forty-four".