87746640 has 40 divisors (see below), whose sum is σ = 272015328. Its totient is φ = 23399040.

The previous prime is 87746611. The next prime is 87746651. The reversal of 87746640 is 4664778.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 87746592 and 87746601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182566 + ... + 183045.

Almost surely, 2^87746640 is an apocalyptic number.

87746640 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

87746640 is an abundant number, since it is smaller than the sum of its proper divisors (184268688).

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

87746640 is a wasteful number, since it uses less digits than its factorization.

87746640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365627 (or 365621 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 87746640 is about 9367.3176523485. The cubic root of 87746640 is about 444.3687384014.

The spelling of 87746640 in words is "eighty-seven million, seven hundred forty-six thousand, six hundred forty".