642006057 has 16 divisors (see below), whose sum is σ = 1067231232. Its totient is φ = 333509520.

The previous prime is 642006049. The next prime is 642006059. The reversal of 642006057 is 750600246.

It is not a de Polignac number, because 642006057 - 2³ = 642006049 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642006059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1389393 + ... + 1389854.

It is an arithmetic number, because the mean of its divisors is an integer number (66701952).

Almost surely, 2^642006057 is an apocalyptic number.

It is an amenable number.

642006057 is a deficient number, since it is larger than the sum of its proper divisors (425225175).

642006057 is a wasteful number, since it uses less digits than its factorization.

642006057 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779268.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 642006057 is about 25337.8384437189. The cubic root of 642006057 is about 862.6733366388.

The spelling of 642006057 in words is "six hundred forty-two million, six thousand, fifty-seven".