87761889 has 6 divisors (see below), whose sum is σ = 126767186. Its totient is φ = 58507920.

The previous prime is 87761887. The next prime is 87761897. The reversal of 87761889 is 98816778.

It can be written as a sum of positive squares in only one way, i.e., 71115489 + 16646400 = 8433^2 + 4080^2 .

It is not a de Polignac number, because 87761889 - 2¹ = 87761887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87761887) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4875652 + ... + 4875669.

Almost surely, 2^87761889 is an apocalyptic number.

It is an amenable number.

87761889 is a deficient number, since it is larger than the sum of its proper divisors (39005297).

87761889 is a wasteful number, since it uses less digits than its factorization.

87761889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9751327 (or 9751324 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 54.

The square root of 87761889 is about 9368.1315639780. The cubic root of 87761889 is about 444.3944783666.

The spelling of 87761889 in words is "eighty-seven million, seven hundred sixty-one thousand, eight hundred eighty-nine".