77478068 has 12 divisors (see below), whose sum is σ = 135952740. Its totient is φ = 38634432.

The previous prime is 77478059. The next prime is 77478073. The reversal of 77478068 is 86087477.

It can be written as a sum of positive squares in 2 ways, for example, as 62283664 + 15194404 = 7892^2 + 3898^2 .

It is a super-3 number, since 3×77478068³ (a number of 25 digits) contains 333 as substring.

It is a congruent 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 3 ways as a sum of consecutive naturals, for example, 24473 + ... + 27456.

It is an arithmetic number, because the mean of its divisors is an integer number (11329395).

Almost surely, 2^77478068 is an apocalyptic number.

It is an amenable number.

77478068 is a deficient number, since it is larger than the sum of its proper divisors (58474672).

77478068 is a wasteful number, since it uses less digits than its factorization.

77478068 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52306 (or 52304 counting only the distinct ones).

The product of its (nonzero) digits is 526848, while the sum is 47.

The square root of 77478068 is about 8802.1626887942. The cubic root of 77478068 is about 426.3107271803.

The spelling of 77478068 in words is "seventy-seven million, four hundred seventy-eight thousand, sixty-eight".