1642687057 has 8 divisors (see below), whose sum is σ = 1795212000. Its totient is φ = 1490693760.

The previous prime is 1642687037. The next prime is 1642687087. The reversal of 1642687057 is 7507862461.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1642687057 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1642686998 and 1642687016.

It is not an unprimeable number, because it can be changed into a prime (1642687037) 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, 126432 + ... + 138817.

It is an arithmetic number, because the mean of its divisors is an integer number (224401500).

Almost surely, 2^1642687057 is an apocalyptic number.

It is an amenable number.

1642687057 is a deficient number, since it is larger than the sum of its proper divisors (152524943).

1642687057 is a wasteful number, since it uses less digits than its factorization.

1642687057 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265823.

The product of its (nonzero) digits is 564480, while the sum is 46.

The square root of 1642687057 is about 40530.0759560107. The cubic root of 1642687057 is about 1179.9174166565.

The spelling of 1642687057 in words is "one billion, six hundred forty-two million, six hundred eighty-seven thousand, fifty-seven".