87973789 has 4 divisors (see below), whose sum is σ = 88666624. Its totient is φ = 87280956.

The previous prime is 87973751. The next prime is 87973813. The reversal of 87973789 is 98737978.

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 a cyclic number.

It is not a de Polignac number, because 87973789 - 2¹⁷ = 87842717 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 (87973709) 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, 346227 + ... + 346480.

It is an arithmetic number, because the mean of its divisors is an integer number (22166656).

Almost surely, 2^87973789 is an apocalyptic number.

It is an amenable number.

87973789 is a deficient number, since it is larger than the sum of its proper divisors (692835).

87973789 is a wasteful number, since it uses less digits than its factorization.

87973789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 692834.

The product of its digits is 5334336, while the sum is 58.

The square root of 87973789 is about 9379.4343646086. The cubic root of 87973789 is about 444.7518525603.

It can be divided in two parts, 8 and 7973789, that added together give a palindrome (7973797).

The spelling of 87973789 in words is "eighty-seven million, nine hundred seventy-three thousand, seven hundred eighty-nine".