77750000 has 70 divisors (see below), whose sum is σ = 188903832. Its totient is φ = 31000000.

The previous prime is 77749979. The next prime is 77750017. The reversal of 77750000 is 5777.

It is a nialpdrome in base 10.

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 13 ways as a sum of consecutive naturals, for example, 249845 + ... + 250155.

Almost surely, 2^77750000 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77750000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94451916).

77750000 is an abundant number, since it is smaller than the sum of its proper divisors (111153832).

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

77750000 is an frugal number, since it uses more digits than its factorization.

77750000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 349 (or 318 counting only the distinct ones).

The product of its (nonzero) digits is 1715, while the sum is 26.

The square root of 77750000 is about 8817.5960442742. The cubic root of 77750000 is about 426.8088989782.

Adding to 77750000 its reverse (5777), we get a palindrome (77755777).

The spelling of 77750000 in words is "seventy-seven million, seven hundred fifty thousand".