642548899 has 8 divisors (see below), whose sum is σ = 650961360. Its totient is φ = 634152576.

The previous prime is 642548887. The next prime is 642548903. The reversal of 642548899 is 998845246.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-642548899 is a prime.

It is a super-2 number, since 2×642548899² = 825738175212224402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642548869) 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, 90279 + ... + 97135.

It is an arithmetic number, because the mean of its divisors is an integer number (81370170).

Almost surely, 2^642548899 is an apocalyptic number.

642548899 is a deficient number, since it is larger than the sum of its proper divisors (8412461).

642548899 is a wasteful number, since it uses less digits than its factorization.

642548899 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8069.

The product of its digits is 4976640, while the sum is 55.

The square root of 642548899 is about 25348.5482621786. The cubic root of 642548899 is about 862.9164098355.

It can be divided in two parts, 64254 and 8899, that added together give a triangular number (73153 = T₃₈₂).

The spelling of 642548899 in words is "six hundred forty-two million, five hundred forty-eight thousand, eight hundred ninety-nine".