1072620665 has 16 divisors (see below), whose sum is σ = 1307335680. Its totient is φ = 844730880.

The previous prime is 1072620641. The next prime is 1072620667. The reversal of 1072620665 is 5660262701.

It is a de Polignac number, because none of the positive numbers 2^k-1072620665 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1072620667) 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, 86846 + ... + 98424.

It is an arithmetic number, because the mean of its divisors is an integer number (81708480).

Almost surely, 2^1072620665 is an apocalyptic number.

It is an amenable number.

1072620665 is a deficient number, since it is larger than the sum of its proper divisors (234715015).

1072620665 is a wasteful number, since it uses less digits than its factorization.

1072620665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11872.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 1072620665 is about 32750.8880032282. Note that the first 3 decimals coincide. The cubic root of 1072620665 is about 1023.6434690317.

The spelling of 1072620665 in words is "one billion, seventy-two million, six hundred twenty thousand, six hundred sixty-five".