7661128287 has 8 divisors (see below), whose sum is σ = 10382294320. Its totient is φ = 5023690560.

The previous prime is 7661128271. The next prime is 7661128337. The reversal of 7661128287 is 7828211667.

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

It is not a de Polignac number, because 7661128287 - 2⁴ = 7661128271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7661128207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20931862 + ... + 20932227.

It is an arithmetic number, because the mean of its divisors is an integer number (1297786790).

Almost surely, 2^7661128287 is an apocalyptic number.

7661128287 is a deficient number, since it is larger than the sum of its proper divisors (2721166033).

7661128287 is a wasteful number, since it uses less digits than its factorization.

7661128287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41864153.

The product of its digits is 451584, while the sum is 48.

The square root of 7661128287 is about 87527.8714867442. The cubic root of 7661128287 is about 1971.3523045983.

The spelling of 7661128287 in words is "seven billion, six hundred sixty-one million, one hundred twenty-eight thousand, two hundred eighty-seven".