7491808889 has 8 divisors (see below), whose sum is σ = 7887855840. Its totient is φ = 7095936096.

The previous prime is 7491808861. The next prime is 7491808901. The reversal of 7491808889 is 9888081947.

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 7491808889 - 2⁸ = 7491808633 is a prime.

It is a super-2 number, since 2×7491808889² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7491808589) 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, 49934 + ... + 132200.

It is an arithmetic number, because the mean of its divisors is an integer number (985981980).

Almost surely, 2^7491808889 is an apocalyptic number.

It is an amenable number.

7491808889 is a deficient number, since it is larger than the sum of its proper divisors (396046951).

7491808889 is a wasteful number, since it uses less digits than its factorization.

7491808889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87079.

The product of its (nonzero) digits is 9289728, while the sum is 62.

The square root of 7491808889 is about 86555.2360576759. The cubic root of 7491808889 is about 1956.7209584400.

The spelling of 7491808889 in words is "seven billion, four hundred ninety-one million, eight hundred eight thousand, eight hundred eighty-nine".