87726640 has 20 divisors (see below), whose sum is σ = 203964624. Its totient is φ = 35090624.

The previous prime is 87726637. The next prime is 87726649. The reversal of 87726640 is 4662778.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 87726593 and 87726602.

It is not an unprimeable number, because it can be changed into a prime (87726649) 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, 548212 + ... + 548371.

Almost surely, 2^87726640 is an apocalyptic number.

87726640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87726640 is an abundant number, since it is smaller than the sum of its proper divisors (116237984).

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

87726640 is a wasteful number, since it uses less digits than its factorization.

87726640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1096596 (or 1096590 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 87726640 is about 9366.2500500467. The cubic root of 87726640 is about 444.3349743352.

The spelling of 87726640 in words is "eighty-seven million, seven hundred twenty-six thousand, six hundred forty".