642490877 has 8 divisors (see below), whose sum is σ = 777468096. Its totient is φ = 518311872.

The previous prime is 642490867. The next prime is 642490879. The reversal of 642490877 is 778094246.

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

It is a cyclic number.

It is not a de Polignac number, because 642490877 - 2⁴ = 642490861 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642490879) 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 7 ways as a sum of consecutive naturals, for example, 2699423 + ... + 2699660.

It is an arithmetic number, because the mean of its divisors is an integer number (97183512).

Almost surely, 2^642490877 is an apocalyptic number.

It is an amenable number.

642490877 is a deficient number, since it is larger than the sum of its proper divisors (134977219).

642490877 is a wasteful number, since it uses less digits than its factorization.

642490877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5399107.

The product of its (nonzero) digits is 677376, while the sum is 47.

The square root of 642490877 is about 25347.4037526529. The cubic root of 642490877 is about 862.8904353439.

The spelling of 642490877 in words is "six hundred forty-two million, four hundred ninety thousand, eight hundred seventy-seven".