87620436 has 18 divisors (see below), whose sum is σ = 221485082. Its totient is φ = 29206800.

The previous prime is 87620417. The next prime is 87620441. The reversal of 87620436 is 63402678.

It can be written as a sum of positive squares in only one way, i.e., 87048900 + 571536 = 9330^2 + 756^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2433901 = 87620436 / (8 + 7 + 6 + 2 + 0 + 4 + 3 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 87620436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1216915 + ... + 1216986.

Almost surely, 2^87620436 is an apocalyptic number.

It is an amenable number.

87620436 is an abundant number, since it is smaller than the sum of its proper divisors (133864646).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87620436 is a wasteful number, since it uses less digits than its factorization.

87620436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2433911 (or 2433906 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 36.

The square root of 87620436 is about 9360.5788282563. The cubic root of 87620436 is about 444.1555943596.

It can be divided in two parts, 876 and 20436, that added together give a palindrome (21312).

The spelling of 87620436 in words is "eighty-seven million, six hundred twenty thousand, four hundred thirty-six".