87257977 has 2 divisors, whose sum is σ = 87257978. Its totient is φ = 87257976.

The previous prime is 87257971. The next prime is 87258019. The reversal of 87257977 is 77975278.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 84198976 + 3059001 = 9176^2 + 1749^2 .

It is a cyclic number.

It is not a de Polignac number, because 87257977 - 2³ = 87257969 is a prime.

It is a super-2 number, since 2×87257977² = 15227909100265058, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87257971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43628988 + 43628989.

It is an arithmetic number, because the mean of its divisors is an integer number (43628989).

Almost surely, 2^87257977 is an apocalyptic number.

It is an amenable number.

87257977 is a deficient number, since it is larger than the sum of its proper divisors (1).

87257977 is an equidigital number, since it uses as much as digits as its factorization.

87257977 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1728720, while the sum is 52.

The square root of 87257977 is about 9341.1978353956. The cubic root of 87257977 is about 443.5423025377.

It can be divided in two parts, 87 and 257977, that added together give a square (258064 = 508²).

The spelling of 87257977 in words is "eighty-seven million, two hundred fifty-seven thousand, nine hundred seventy-seven".