87940645 has 32 divisors (see below), whose sum is σ = 123540480. Its totient is φ = 59512320.

The previous prime is 87940639. The next prime is 87940651. The reversal of 87940645 is 54604978.

It is an interprime number because it is at equal distance from previous prime (87940639) and next prime (87940651).

It is not a de Polignac number, because 87940645 - 2³ = 87940637 is a prime.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37137 + ... + 39433.

It is an arithmetic number, because the mean of its divisors is an integer number (3860640).

Almost surely, 2^87940645 is an apocalyptic number.

87940645 is the 7657-th pentagonal number.

It is an amenable number.

87940645 is a deficient number, since it is larger than the sum of its proper divisors (35599835).

87940645 is a wasteful number, since it uses less digits than its factorization.

87940645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2365.

The product of its (nonzero) digits is 241920, while the sum is 43.

The square root of 87940645 is about 9377.6673538786. The cubic root of 87940645 is about 444.6959923352.

The spelling of 87940645 in words is "eighty-seven million, nine hundred forty thousand, six hundred forty-five".