642051386 has 8 divisors (see below), whose sum is σ = 963481824. Its totient is φ = 320890780.

The previous prime is 642051383. The next prime is 642051391. The reversal of 642051386 is 683150246.

642051386 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (642051383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 61400 + ... + 71091.

It is an arithmetic number, because the mean of its divisors is an integer number (120435228).

Almost surely, 2^642051386 is an apocalyptic number.

642051386 is a deficient number, since it is larger than the sum of its proper divisors (321430438).

642051386 is a wasteful number, since it uses less digits than its factorization.

642051386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134916.

The product of its (nonzero) digits is 34560, while the sum is 35.

The square root of 642051386 is about 25338.7329201758. The cubic root of 642051386 is about 862.6936392507.

The spelling of 642051386 in words is "six hundred forty-two million, fifty-one thousand, three hundred eighty-six".