642140763 has 16 divisors (see below), whose sum is σ = 934471296. Its totient is φ = 388989440.

The previous prime is 642140753. The next prime is 642140819. The reversal of 642140763 is 367041246.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 642140763 - 2⁴ = 642140747 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (642140713) 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, 100420 + ... + 106622.

It is an arithmetic number, because the mean of its divisors is an integer number (58404456).

Almost surely, 2^642140763 is an apocalyptic number.

642140763 is a deficient number, since it is larger than the sum of its proper divisors (292330533).

642140763 is a wasteful number, since it uses less digits than its factorization.

642140763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9354.

The product of its (nonzero) digits is 24192, while the sum is 33.

The square root of 642140763 is about 25340.4965026339. The cubic root of 642140763 is about 862.7336679221.

The spelling of 642140763 in words is "six hundred forty-two million, one hundred forty thousand, seven hundred sixty-three".