87644077 has 4 divisors (see below), whose sum is σ = 87764380. Its totient is φ = 87523776.

The previous prime is 87644071. The next prime is 87644113. The reversal of 87644077 is 77044678.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81974916 + 5669161 = 9054^2 + 2381^2 .

It is a cyclic number.

It is not a de Polignac number, because 87644077 - 2¹⁵ = 87611309 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 (87644071) 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, 59052 + ... + 60517.

It is an arithmetic number, because the mean of its divisors is an integer number (21941095).

Almost surely, 2^87644077 is an apocalyptic number.

It is an amenable number.

87644077 is a deficient number, since it is larger than the sum of its proper divisors (120303).

87644077 is a wasteful number, since it uses less digits than its factorization.

87644077 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120302.

The product of its (nonzero) digits is 263424, while the sum is 43.

The square root of 87644077 is about 9361.8415389281. The cubic root of 87644077 is about 444.1955368611.

The spelling of 87644077 in words is "eighty-seven million, six hundred forty-four thousand, seventy-seven".