642072811 has 8 divisors (see below), whose sum is σ = 653808960. Its totient is φ = 630432072.

The previous prime is 642072799. The next prime is 642072883. The reversal of 642072811 is 118270246.

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 642072811 - 2¹⁵ = 642040043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642072911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10201 + ... + 37258.

It is an arithmetic number, because the mean of its divisors is an integer number (81726120).

Almost surely, 2^642072811 is an apocalyptic number.

642072811 is a deficient number, since it is larger than the sum of its proper divisors (11736149).

642072811 is a wasteful number, since it uses less digits than its factorization.

642072811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47705.

The product of its (nonzero) digits is 5376, while the sum is 31.

The square root of 642072811 is about 25339.1556883808. The cubic root of 642072811 is about 862.7032350587.

The spelling of 642072811 in words is "six hundred forty-two million, seventy-two thousand, eight hundred eleven".