642470401 has 4 divisors (see below), whose sum is σ = 656140032. Its totient is φ = 628800772.

The previous prime is 642470383. The next prime is 642470419. The reversal of 642470401 is 104074246.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (642470383) and next prime (642470419).

It is a cyclic number.

It is not a de Polignac number, because 642470401 - 2⁹ = 642469889 is a prime.

It is a super-2 number, since 2×642470401² = 825536432322201602, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 642470401.

It is not an unprimeable number, because it can be changed into a prime (642470461) 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, 6834745 + ... + 6834838.

It is an arithmetic number, because the mean of its divisors is an integer number (164035008).

Almost surely, 2^642470401 is an apocalyptic number.

It is an amenable number.

642470401 is a deficient number, since it is larger than the sum of its proper divisors (13669631).

642470401 is a wasteful number, since it uses less digits than its factorization.

642470401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13669630.

The product of its (nonzero) digits is 5376, while the sum is 28.

The square root of 642470401 is about 25346.9998421904. Note that the first 3 decimals coincide. The cubic root of 642470401 is about 862.8812685563.

The spelling of 642470401 in words is "six hundred forty-two million, four hundred seventy thousand, four hundred one".