1679638641 has 16 divisors (see below), whose sum is σ = 2474354304. Its totient is φ = 1008068864.

The previous prime is 1679638637. The next prime is 1679638651. The reversal of 1679638641 is 1468369761.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1679638641 - 2² = 1679638637 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (1679638601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 714786 + ... + 717131.

It is an arithmetic number, because the mean of its divisors is an integer number (154647144).

Almost surely, 2^1679638641 is an apocalyptic number.

It is an amenable number.

1679638641 is a deficient number, since it is larger than the sum of its proper divisors (794715663).

1679638641 is a wasteful number, since it uses less digits than its factorization.

1679638641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1431960.

The product of its digits is 1306368, while the sum is 51.

The square root of 1679638641 is about 40983.3946983409. The cubic root of 1679638641 is about 1188.6991507228.

The spelling of 1679638641 in words is "one billion, six hundred seventy-nine million, six hundred thirty-eight thousand, six hundred forty-one".