7643742087 has 4 divisors (see below), whose sum is σ = 10191656120. Its totient is φ = 5095828056.

The previous prime is 7643742083. The next prime is 7643742089. The reversal of 7643742087 is 7802473467.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 7643742087 - 2² = 7643742083 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 (7643742083) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1273957012 + ... + 1273957017.

It is an arithmetic number, because the mean of its divisors is an integer number (2547914030).

Almost surely, 2^7643742087 is an apocalyptic number.

7643742087 is a deficient number, since it is larger than the sum of its proper divisors (2547914033).

7643742087 is a wasteful number, since it uses less digits than its factorization.

7643742087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547914032.

The product of its (nonzero) digits is 1580544, while the sum is 48.

The square root of 7643742087 is about 87428.4969961168. The cubic root of 7643742087 is about 1969.8599097303.

The spelling of 7643742087 in words is "seven billion, six hundred forty-three million, seven hundred forty-two thousand, eighty-seven".