87720369 has 8 divisors (see below), whose sum is σ = 127593312. Its totient is φ = 53163840.

The previous prime is 87720343. The next prime is 87720371. The reversal of 87720369 is 96302778.

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

It is not a de Polignac number, because 87720369 - 2⁵ = 87720337 is a prime.

It is a super-2 number, since 2×87720369² = 15389726274992322, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 87720369.

It is not an unprimeable number, because it can be changed into a prime (87720319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1329064 + ... + 1329129.

It is an arithmetic number, because the mean of its divisors is an integer number (15949164).

Almost surely, 2^87720369 is an apocalyptic number.

It is an amenable number.

87720369 is a deficient number, since it is larger than the sum of its proper divisors (39872943).

87720369 is a wasteful number, since it uses less digits than its factorization.

87720369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2658207.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 87720369 is about 9365.9152782843. The cubic root of 87720369 is about 444.3243865554.

The spelling of 87720369 in words is "eighty-seven million, seven hundred twenty thousand, three hundred sixty-nine".