642617677 has 16 divisors (see below), whose sum is σ = 760152960. Its totient is φ = 537527232.

The previous prime is 642617611. The next prime is 642617683. The reversal of 642617677 is 776716246.

It is a cyclic number.

It is not a de Polignac number, because 642617677 - 2²³ = 634229069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642617687) 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, 50878 + ... + 62239.

It is an arithmetic number, because the mean of its divisors is an integer number (47509560).

Almost surely, 2^642617677 is an apocalyptic number.

It is an amenable number.

642617677 is a deficient number, since it is larger than the sum of its proper divisors (117535283).

642617677 is a wasteful number, since it uses less digits than its factorization.

642617677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113172.

The product of its digits is 592704, while the sum is 46.

The square root of 642617677 is about 25349.9048716164. The cubic root of 642617677 is about 862.9471974002.

The spelling of 642617677 in words is "six hundred forty-two million, six hundred seventeen thousand, six hundred seventy-seven".