642404077 has 8 divisors (see below), whose sum is σ = 738573696. Its totient is φ = 547333872.

The previous prime is 642404071. The next prime is 642404083. The reversal of 642404077 is 770404246.

It is an interprime number because it is at equal distance from previous prime (642404071) and next prime (642404083).

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 642404077 - 2³ = 642404069 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642404071) 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, 273598 + ... + 275935.

It is an arithmetic number, because the mean of its divisors is an integer number (92321712).

Almost surely, 2^642404077 is an apocalyptic number.

It is an amenable number.

642404077 is a deficient number, since it is larger than the sum of its proper divisors (96169619).

642404077 is a wasteful number, since it uses less digits than its factorization.

642404077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 549707.

The product of its (nonzero) digits is 37632, while the sum is 34.

The square root of 642404077 is about 25345.6914879038. The cubic root of 642404077 is about 862.8515749929.

The spelling of 642404077 in words is "six hundred forty-two million, four hundred four thousand, seventy-seven".