87780157 has 8 divisors (see below), whose sum is σ = 90091584. Its totient is φ = 85481088.

The previous prime is 87780151. The next prime is 87780179. The reversal of 87780157 is 75108778.

It is a happy number.

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 87780157 - 2¹¹ = 87778109 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87780151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12288 + ... + 18070.

It is an arithmetic number, because the mean of its divisors is an integer number (11261448).

Almost surely, 2^87780157 is an apocalyptic number.

It is an amenable number.

87780157 is a deficient number, since it is larger than the sum of its proper divisors (2311427).

87780157 is a wasteful number, since it uses less digits than its factorization.

87780157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6179.

The product of its (nonzero) digits is 109760, while the sum is 43.

The square root of 87780157 is about 9369.1065209016. The cubic root of 87780157 is about 444.4253104101.

The spelling of 87780157 in words is "eighty-seven million, seven hundred eighty thousand, one hundred fifty-seven".