642276757 has 2 divisors, whose sum is σ = 642276758. Its totient is φ = 642276756.

The previous prime is 642276749. The next prime is 642276797. The reversal of 642276757 is 757672246.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 561168721 + 81108036 = 23689^2 + 9006^2 .

It is a cyclic number.

It is not a de Polignac number, because 642276757 - 2³ = 642276749 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (642276797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 321138378 + 321138379.

It is an arithmetic number, because the mean of its divisors is an integer number (321138379).

Almost surely, 2^642276757 is an apocalyptic number.

It is an amenable number.

642276757 is a deficient number, since it is larger than the sum of its proper divisors (1).

642276757 is an equidigital number, since it uses as much as digits as its factorization.

642276757 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987840, while the sum is 46.

The square root of 642276757 is about 25343.1796939532. The cubic root of 642276757 is about 862.7945675086.

The spelling of 642276757 in words is "six hundred forty-two million, two hundred seventy-six thousand, seven hundred fifty-seven".