87123490761 has 4 divisors (see below), whose sum is σ = 116164654352. Its totient is φ = 58082327172.

The previous prime is 87123490747. The next prime is 87123490781. The reversal of 87123490761 is 16709432178.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 87123490761 - 2⁷ = 87123490633 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87123490761.

It is not an unprimeable number, because it can be changed into a prime (87123490721) 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, 14520581791 + ... + 14520581796.

It is an arithmetic number, because the mean of its divisors is an integer number (29041163588).

Almost surely, 2^87123490761 is an apocalyptic number.

It is an amenable number.

87123490761 is a deficient number, since it is larger than the sum of its proper divisors (29041163591).

87123490761 is a wasteful number, since it uses less digits than its factorization.

87123490761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29041163590.

The product of its (nonzero) digits is 508032, while the sum is 48.

The spelling of 87123490761 in words is "eighty-seven billion, one hundred twenty-three million, four hundred ninety thousand, seven hundred sixty-one".