87445391 has 20 divisors (see below), whose sum is σ = 102345384. Its totient is φ = 74077200.

The previous prime is 87445387. The next prime is 87445441. The reversal of 87445391 is 19354478.

It is not a de Polignac number, because 87445391 - 2² = 87445387 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87445321) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1433501 + ... + 1433561.

Almost surely, 2^87445391 is an apocalyptic number.

87445391 is a deficient number, since it is larger than the sum of its proper divisors (14899993).

87445391 is an frugal number, since it uses more digits than its factorization.

87445391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148 (or 91 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 87445391 is about 9351.2240375258. The cubic root of 87445391 is about 443.8596244138.

The spelling of 87445391 in words is "eighty-seven million, four hundred forty-five thousand, three hundred ninety-one".