87320791424 has 64 divisors (see below), whose sum is σ = 178942765680. Its totient is φ = 42426931200.

The previous prime is 87320791387. The next prime is 87320791429. The reversal of 87320791424 is 42419702378.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×87320791424² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87320791429) 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, 580694 + ... + 715434.

Almost surely, 2^87320791424 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 87320791424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89471382840).

87320791424 is an abundant number, since it is smaller than the sum of its proper divisors (91621974256).

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

87320791424 is a wasteful number, since it uses less digits than its factorization.

87320791424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134899 (or 134887 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 87320791424 in words is "eighty-seven billion, three hundred twenty million, seven hundred ninety-one thousand, four hundred twenty-four".