87202172749 has 4 divisors (see below), whose sum is σ = 88065560700. Its totient is φ = 86338784800.

The previous prime is 87202172663. The next prime is 87202172819. The reversal of 87202172749 is 94727120278.

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 63244705225 + 23957467524 = 251485^2 + 154782^2 .

It is a cyclic number.

It is not a de Polignac number, because 87202172749 - 2³¹ = 85054689101 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 (87202172549) 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, 431693824 + ... + 431694025.

It is an arithmetic number, because the mean of its divisors is an integer number (22016390175).

Almost surely, 2^87202172749 is an apocalyptic number.

It is an amenable number.

87202172749 is a deficient number, since it is larger than the sum of its proper divisors (863387951).

87202172749 is a wasteful number, since it uses less digits than its factorization.

87202172749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 863387950.

The product of its (nonzero) digits is 790272, while the sum is 49.

The spelling of 87202172749 in words is "eighty-seven billion, two hundred two million, one hundred seventy-two thousand, seven hundred forty-nine".