87421776 has 80 divisors (see below), whose sum is σ = 251650560. Its totient is φ = 25966080.

The previous prime is 87421759. The next prime is 87421777. The reversal of 87421776 is 67712478.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87421777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15681 + ... + 20511.

It is an arithmetic number, because the mean of its divisors is an integer number (3145632).

Almost surely, 2^87421776 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 87421776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125825280).

87421776 is an abundant number, since it is smaller than the sum of its proper divisors (164228784).

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

87421776 is a wasteful number, since it uses less digits than its factorization.

87421776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4884 (or 4878 counting only the distinct ones).

The product of its digits is 131712, while the sum is 42.

The square root of 87421776 is about 9349.9612833423. The cubic root of 87421776 is about 443.8196654230.

The spelling of 87421776 in words is "eighty-seven million, four hundred twenty-one thousand, seven hundred seventy-six".