642764061 has 12 divisors (see below), whose sum is σ = 929234592. Its totient is φ = 428141256.

The previous prime is 642764039. The next prime is 642764071. The reversal of 642764061 is 160467246.

642764061 is a `hidden beast` number, since 6 + 4 + 2 + 7 + 640 + 6 + 1 = 666.

It is not a de Polignac number, because 642764061 - 2⁶ = 642763997 is a prime.

It is a super-2 number, since 2×642764061² = 826291276226423442, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642764071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19401 + ... + 40766.

It is an arithmetic number, because the mean of its divisors is an integer number (77436216).

Almost surely, 2^642764061 is an apocalyptic number.

It is an amenable number.

642764061 is a deficient number, since it is larger than the sum of its proper divisors (286470531).

642764061 is a wasteful number, since it uses less digits than its factorization.

642764061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61360 (or 61357 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 642764061 is about 25352.7919764274. The cubic root of 642764061 is about 863.0127169549.

The spelling of 642764061 in words is "six hundred forty-two million, seven hundred sixty-four thousand, sixty-one".