642394701 has 12 divisors (see below), whose sum is σ = 999280828. Its totient is φ = 395319744.

The previous prime is 642394699. The next prime is 642394729. The reversal of 642394701 is 107493246.

642394701 is a `hidden beast` number, since 642 + 3 + 9 + 4 + 7 + 0 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 45765225 + 596629476 = 6765^2 + 24426^2 .

It is not a de Polignac number, because 642394701 - 2¹ = 642394699 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642394771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2745160 + ... + 2745393.

Almost surely, 2^642394701 is an apocalyptic number.

It is an amenable number.

642394701 is a deficient number, since it is larger than the sum of its proper divisors (356886127).

642394701 is a wasteful number, since it uses less digits than its factorization.

642394701 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5490572 (or 5490569 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 642394701 is about 25345.5065248261. The cubic root of 642394701 is about 862.8473771492.

It can be divided in two parts, 6423 and 94701, that added together give a square (101124 = 318²).

The spelling of 642394701 in words is "six hundred forty-two million, three hundred ninety-four thousand, seven hundred one".