77686490 has 32 divisors (see below), whose sum is σ = 160116480. Its totient is φ = 26584704.

The previous prime is 77686487. The next prime is 77686507. The reversal of 77686490 is 9468677.

It is a happy number.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68246 + ... + 69374.

It is an arithmetic number, because the mean of its divisors is an integer number (5003640).

Almost surely, 2^77686490 is an apocalyptic number.

77686490 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

77686490 is an abundant number, since it is smaller than the sum of its proper divisors (82429990).

77686490 is a wasteful number, since it uses less digits than its factorization.

77686490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2126.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 77686490 is about 8813.9939868371. The cubic root of 77686490 is about 426.6926545314.

The spelling of 77686490 in words is "seventy-seven million, six hundred eighty-six thousand, four hundred ninety".