642361786 has 16 divisors (see below), whose sum is σ = 1052826048. Its totient is φ = 291513600.

The previous prime is 642361771. The next prime is 642361787. The reversal of 642361786 is 687163246.

642361786 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×642361786² = 825257328226219592, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642361787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9255 + ... + 37018.

It is an arithmetic number, because the mean of its divisors is an integer number (65801628).

Almost surely, 2^642361786 is an apocalyptic number.

642361786 is a deficient number, since it is larger than the sum of its proper divisors (410464262).

642361786 is a wasteful number, since it uses less digits than its factorization.

642361786 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46917.

The product of its digits is 290304, while the sum is 43.

The square root of 642361786 is about 25344.8571903651. The cubic root of 642361786 is about 862.8326400483.

The spelling of 642361786 in words is "six hundred forty-two million, three hundred sixty-one thousand, seven hundred eighty-six".