77555890 has 16 divisors (see below), whose sum is σ = 139828032. Its totient is φ = 30971824.

The previous prime is 77555851. The next prime is 77555897. The reversal of 77555890 is 9855577.

It is a self number, because there is not a number n which added to its sum of digits gives 77555890.

It is not an unprimeable number, because it can be changed into a prime (77555897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 477 + ... + 12463.

It is an arithmetic number, because the mean of its divisors is an integer number (8739252).

Almost surely, 2^77555890 is an apocalyptic number.

77555890 is a deficient number, since it is larger than the sum of its proper divisors (62272142).

77555890 is a wasteful number, since it uses less digits than its factorization.

77555890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12641.

The product of its (nonzero) digits is 441000, while the sum is 46.

The square root of 77555890 is about 8806.5821974248. The cubic root of 77555890 is about 426.4534138037.

It can be divided in two parts, 775 and 55890, that added together give a palindrome (56665).

The spelling of 77555890 in words is "seventy-seven million, five hundred fifty-five thousand, eight hundred ninety".