642764645 has 16 divisors (see below), whose sum is σ = 835686720. Its totient is φ = 472706304.

The previous prime is 642764587. The next prime is 642764657. The reversal of 642764645 is 546467246.

It is a cyclic number.

It is not a de Polignac number, because 642764645 - 2¹⁰ = 642763621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642764596 and 642764605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84275 + ... + 91584.

It is an arithmetic number, because the mean of its divisors is an integer number (52230420).

Almost surely, 2^642764645 is an apocalyptic number.

It is an amenable number.

642764645 is a deficient number, since it is larger than the sum of its proper divisors (192922075).

642764645 is a wasteful number, since it uses less digits than its factorization.

642764645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175924.

The product of its digits is 967680, while the sum is 44.

The square root of 642764645 is about 25352.8034938939. The cubic root of 642764645 is about 863.0129783257.

It can be divided in two parts, 64276 and 4645, that added together give a cube (68921 = 41³).

The spelling of 642764645 in words is "six hundred forty-two million, seven hundred sixty-four thousand, six hundred forty-five".