87777157 has 8 divisors (see below), whose sum is σ = 95367384. Its totient is φ = 80306688.

The previous prime is 87777139. The next prime is 87777161. The reversal of 87777157 is 75177778.

It can be written as a sum of positive squares in 4 ways, for example, as 279841 + 87497316 = 529^2 + 9354^2 .

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 87777157 - 2²³ = 79388549 is a prime.

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 87777157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87777127) 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, 28408 + ... + 31345.

It is an arithmetic number, because the mean of its divisors is an integer number (11920923).

Almost surely, 2^87777157 is an apocalyptic number.

It is an amenable number.

87777157 is a deficient number, since it is larger than the sum of its proper divisors (7590227).

87777157 is a wasteful number, since it uses less digits than its factorization.

87777157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59879.

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

The square root of 87777157 is about 9368.9464188883. The cubic root of 87777157 is about 444.4202474165.

The spelling of 87777157 in words is "eighty-seven million, seven hundred seventy-seven thousand, one hundred fifty-seven".