642504029 has 4 divisors (see below), whose sum is σ = 644597184. Its totient is φ = 640410876.

The previous prime is 642504013. The next prime is 642504059. The reversal of 642504029 is 920405246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 920405246 = 2 ⋅460202623.

It is a cyclic number.

It is not a de Polignac number, because 642504029 - 2⁴ = 642504013 is a prime.

It is a super-2 number, since 2×642504029² = 825622854562465682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642503986 and 642504004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642504059) 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 3 ways as a sum of consecutive naturals, for example, 1046117 + ... + 1046730.

It is an arithmetic number, because the mean of its divisors is an integer number (161149296).

Almost surely, 2^642504029 is an apocalyptic number.

It is an amenable number.

642504029 is a deficient number, since it is larger than the sum of its proper divisors (2093155).

642504029 is a wasteful number, since it uses less digits than its factorization.

642504029 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2093154.

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 642504029 is about 25347.6631861795. The cubic root of 642504029 is about 862.8963231876.

The spelling of 642504029 in words is "six hundred forty-two million, five hundred four thousand, twenty-nine".