77861764 has 24 divisors (see below), whose sum is σ = 140795928. Its totient is φ = 37647360.

The previous prime is 77861759. The next prime is 77861783. The reversal of 77861764 is 46716877.

It can be written as a sum of positive squares in 4 ways, for example, as 66585600 + 11276164 = 8160^2 + 3358^2 .

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, 24084 + ... + 27124.

It is an arithmetic number, because the mean of its divisors is an integer number (5866497).

Almost surely, 2^77861764 is an apocalyptic number.

77861764 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

77861764 is a deficient number, since it is larger than the sum of its proper divisors (62934164).

77861764 is a wasteful number, since it uses less digits than its factorization.

77861764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3255 (or 3253 counting only the distinct ones).

The product of its digits is 395136, while the sum is 46.

The square root of 77861764 is about 8823.9313233955. The cubic root of 77861764 is about 427.0133106875.

The spelling of 77861764 in words is "seventy-seven million, eight hundred sixty-one thousand, seven hundred sixty-four".