87790251767 has 4 divisors (see below), whose sum is σ = 87792401376. Its totient is φ = 87788102160.

The previous prime is 87790251739. The next prime is 87790251793. The reversal of 87790251767 is 76715209778.

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

It is a cyclic number.

It is not a de Polignac number, because 87790251767 - 2²⁰ = 87789203191 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 (87790251707) 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, 1012334 + ... + 1095627.

It is an arithmetic number, because the mean of its divisors is an integer number (21948100344).

Almost surely, 2^87790251767 is an apocalyptic number.

87790251767 is a deficient number, since it is larger than the sum of its proper divisors (2149609).

87790251767 is a wasteful number, since it uses less digits than its factorization.

87790251767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2149608.

The product of its (nonzero) digits is 10372320, while the sum is 59.

The spelling of 87790251767 in words is "eighty-seven billion, seven hundred ninety million, two hundred fifty-one thousand, seven hundred sixty-seven".