642785044 has 24 divisors (see below), whose sum is σ = 1257068736. Its totient is φ = 285048000.

The previous prime is 642785041. The next prime is 642785083. The reversal of 642785044 is 440587246.

It is a happy number.

It is a super-3 number, since 3×642785044³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 642784988 and 642785006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642785041) 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, 176352 + ... + 179959.

It is an arithmetic number, because the mean of its divisors is an integer number (52377864).

Almost surely, 2^642785044 is an apocalyptic number.

It is an amenable number.

642785044 is a deficient number, since it is larger than the sum of its proper divisors (614283692).

642785044 is a wasteful number, since it uses less digits than its factorization.

642785044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 356367 (or 356365 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 40.

The square root of 642785044 is about 25353.2057933509. The cubic root of 642785044 is about 863.0221078547.

The spelling of 642785044 in words is "six hundred forty-two million, seven hundred eighty-five thousand, forty-four".