87744845 has 4 divisors (see below), whose sum is σ = 105293820. Its totient is φ = 70195872.

The previous prime is 87744823. The next prime is 87744847. The reversal of 87744845 is 54844778.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54844778 = 2 ⋅27422389.

It can be written as a sum of positive squares in 2 ways, for example, as 52722121 + 35022724 = 7261^2 + 5918^2 .

It is a cyclic number.

It is not a de Polignac number, because 87744845 - 2²⁶ = 20635981 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87744845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87744847) 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, 8774480 + ... + 8774489.

It is an arithmetic number, because the mean of its divisors is an integer number (26323455).

Almost surely, 2^87744845 is an apocalyptic number.

It is an amenable number.

87744845 is a deficient number, since it is larger than the sum of its proper divisors (17548975).

87744845 is a wasteful number, since it uses less digits than its factorization.

87744845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17548974.

The product of its digits is 1003520, while the sum is 47.

The square root of 87744845 is about 9367.2218400121. The cubic root of 87744845 is about 444.3657082860.

The spelling of 87744845 in words is "eighty-seven million, seven hundred forty-four thousand, eight hundred forty-five".