77828855 has 8 divisors (see below), whose sum is σ = 100578912. Its totient is φ = 57473568.

The previous prime is 77828843. The next prime is 77828869. The reversal of 77828855 is 55882877.

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 77828855 - 2⁸ = 77828599 is a prime.

It is a super-2 number, since 2×77828855² = 12114661341222050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 598619 + ... + 598748.

It is an arithmetic number, because the mean of its divisors is an integer number (12572364).

Almost surely, 2^77828855 is an apocalyptic number.

77828855 is a deficient number, since it is larger than the sum of its proper divisors (22750057).

77828855 is a wasteful number, since it uses less digits than its factorization.

77828855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1197385.

The product of its digits is 1254400, while the sum is 50.

The square root of 77828855 is about 8822.0663679208. The cubic root of 77828855 is about 426.9531418250.

The spelling of 77828855 in words is "seventy-seven million, eight hundred twenty-eight thousand, eight hundred fifty-five".