642404366 has 8 divisors (see below), whose sum is σ = 984108960. Its totient is φ = 314368048.

The previous prime is 642404363. The next prime is 642404369. The reversal of 642404366 is 663404246.

It is an interprime number because it is at equal distance from previous prime (642404363) and next prime (642404369).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642404363) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3416951 + ... + 3417138.

It is an arithmetic number, because the mean of its divisors is an integer number (123013620).

Almost surely, 2^642404366 is an apocalyptic number.

642404366 is a deficient number, since it is larger than the sum of its proper divisors (341704594).

642404366 is a wasteful number, since it uses less digits than its factorization.

642404366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6834138.

The product of its (nonzero) digits is 82944, while the sum is 35.

The square root of 642404366 is about 25345.6971890694. The cubic root of 642404366 is about 862.8517043840.

The spelling of 642404366 in words is "six hundred forty-two million, four hundred four thousand, three hundred sixty-six".