87288778 has 16 divisors (see below), whose sum is σ = 138832704. Its totient is φ = 41018560.

The previous prime is 87288769. The next prime is 87288791. The reversal of 87288778 is 87788278.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30843 + ... + 33553.

It is an arithmetic number, because the mean of its divisors is an integer number (8677044).

Almost surely, 2^87288778 is an apocalyptic number.

87288778 is a deficient number, since it is larger than the sum of its proper divisors (51543926).

87288778 is a wasteful number, since it uses less digits than its factorization.

87288778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3677.

The product of its digits is 2809856, while the sum is 55.

The square root of 87288778 is about 9342.8463542970. The cubic root of 87288778 is about 443.5944847366.

Subtracting 87288778 from its reverse (87788278), we obtain a triangular number (499500 = T₉₉₉).

The spelling of 87288778 in words is "eighty-seven million, two hundred eighty-eight thousand, seven hundred seventy-eight".