97778550 has 24 divisors (see below), whose sum is σ = 242491176. Its totient is φ = 26074240.

The previous prime is 97778539. The next prime is 97778591. The reversal of 97778550 is 5587779.

It is a self number, because there is not a number n which added to its sum of digits gives 97778550.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 325779 + ... + 326078.

It is an arithmetic number, because the mean of its divisors is an integer number (10103799).

Almost surely, 2^97778550 is an apocalyptic number.

97778550 is an abundant number, since it is smaller than the sum of its proper divisors (144712626).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

97778550 is a wasteful number, since it uses less digits than its factorization.

97778550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 651872 (or 651867 counting only the distinct ones).

The product of its (nonzero) digits is 617400, while the sum is 48.

The square root of 97778550 is about 9888.3036967925. The cubic root of 97778550 is about 460.6960948117.

The spelling of 97778550 in words is "ninety-seven million, seven hundred seventy-eight thousand, five hundred fifty".