87571777 has 8 divisors (see below), whose sum is σ = 94985352. Its totient is φ = 80409600.

The previous prime is 87571769. The next prime is 87571829. The reversal of 87571777 is 77717578.

It can be written as a sum of positive squares in 4 ways, for example, as 410881 + 87160896 = 641^2 + 9336^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87571777 - 2³ = 87571769 is a prime.

It is a super-2 number, since 2×87571777² = 15337632253875458, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87571777.

It is not an unprimeable number, because it can be changed into a prime (87572777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 62124 + ... + 63517.

It is an arithmetic number, because the mean of its divisors is an integer number (11873169).

Almost surely, 2^87571777 is an apocalyptic number.

It is an amenable number.

87571777 is a deficient number, since it is larger than the sum of its proper divisors (7413575).

87571777 is a wasteful number, since it uses less digits than its factorization.

87571777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125699.

The product of its digits is 672280, while the sum is 49.

The square root of 87571777 is about 9357.9793224820. The cubic root of 87571777 is about 444.0733602372.

The spelling of 87571777 in words is "eighty-seven million, five hundred seventy-one thousand, seven hundred seventy-seven".