77980355 has 8 divisors (see below), whose sum is σ = 93676272. Its totient is φ = 62317728.

The previous prime is 77980321. The next prime is 77980361. The reversal of 77980355 is 55308977.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 77980355 - 2⁶ = 77980291 is a prime.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 2837 + ... + 12806.

It is an arithmetic number, because the mean of its divisors is an integer number (11709534).

Almost surely, 2^77980355 is an apocalyptic number.

77980355 is a deficient number, since it is larger than the sum of its proper divisors (15695917).

77980355 is a wasteful number, since it uses less digits than its factorization.

77980355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16645.

The product of its (nonzero) digits is 264600, while the sum is 44.

The square root of 77980355 is about 8830.6486171742. The cubic root of 77980355 is about 427.2299949102.

The spelling of 77980355 in words is "seventy-seven million, nine hundred eighty thousand, three hundred fifty-five".