642920027 has 4 divisors (see below), whose sum is σ = 644262720. Its totient is φ = 641577336.

The previous prime is 642920023. The next prime is 642920071. The reversal of 642920027 is 720029246.

642920027 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 720029246 = 2 ⋅360014623.

It is a cyclic number.

It is not a de Polignac number, because 642920027 - 2² = 642920023 is a prime.

It is a super-3 number, since 3×642920027³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 642919975 and 642920002.

It is not an unprimeable number, because it can be changed into a prime (642920021) 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, 670628 + ... + 671585.

It is an arithmetic number, because the mean of its divisors is an integer number (161065680).

Almost surely, 2^642920027 is an apocalyptic number.

642920027 is a deficient number, since it is larger than the sum of its proper divisors (1342693).

642920027 is a wasteful number, since it uses less digits than its factorization.

642920027 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1342692.

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 642920027 is about 25355.8677035514. The cubic root of 642920027 is about 863.0825143420.

The spelling of 642920027 in words is "six hundred forty-two million, nine hundred twenty thousand, twenty-seven".