642920001 has 8 divisors (see below), whose sum is σ = 857596224. Its totient is φ = 428428560.

The previous prime is 642919999. The next prime is 642920009. The reversal of 642920001 is 100029246.

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

It is not a de Polignac number, because 642920001 - 2¹ = 642919999 is a prime.

It is a super-2 number, since 2×642920001² = 826692255371680002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642920009) 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, 37861 + ... + 52146.

It is an arithmetic number, because the mean of its divisors is an integer number (107199528).

Almost surely, 2^642920001 is an apocalyptic number.

It is an amenable number.

642920001 is a deficient number, since it is larger than the sum of its proper divisors (214676223).

642920001 is a wasteful number, since it uses less digits than its factorization.

642920001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92391.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 642920001 is about 25355.8671908495. The cubic root of 642920001 is about 863.0825027075.

Adding to 642920001 its reverse (100029246), we get a palindrome (742949247).

The spelling of 642920001 in words is "six hundred forty-two million, nine hundred twenty thousand, one".