77287880 has 16 divisors (see below), whose sum is σ = 173897820. Its totient is φ = 30915136.

The previous prime is 77287879. The next prime is 77287883. The reversal of 77287880 is 8878277.

It can be written as a sum of positive squares in 2 ways, for example, as 64995844 + 12292036 = 8062^2 + 3506^2 .

It is not an unprimeable number, because it can be changed into a prime (77287883) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 966059 + ... + 966138.

Almost surely, 2^77287880 is an apocalyptic number.

It is an amenable number.

77287880 is an abundant number, since it is smaller than the sum of its proper divisors (96609940).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

77287880 is a wasteful number, since it uses less digits than its factorization.

77287880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1932208 (or 1932204 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 47.

The square root of 77287880 is about 8791.3525694287. The cubic root of 77287880 is about 425.9616149740.

The spelling of 77287880 in words is "seventy-seven million, two hundred eighty-seven thousand, eight hundred eighty".