77721050 has 24 divisors (see below), whose sum is σ = 157704192. Its totient is φ = 28262000.

The previous prime is 77721047. The next prime is 77721067. The reversal of 77721050 is 5012777.

It is a super-2 number, since 2×77721050² = 12081123226205000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70106 + ... + 71205.

It is an arithmetic number, because the mean of its divisors is an integer number (6571008).

Almost surely, 2^77721050 is an apocalyptic number.

77721050 is an abundant number, since it is smaller than the sum of its proper divisors (79983142).

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

77721050 is a wasteful number, since it uses less digits than its factorization.

77721050 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141334 (or 141329 counting only the distinct ones).

The product of its (nonzero) digits is 3430, while the sum is 29.

The square root of 77721050 is about 8815.9542875403. The cubic root of 77721050 is about 426.7559186929.

It can be divided in two parts, 77 and 721050, that added together give a palindrome (721127).

The spelling of 77721050 in words is "seventy-seven million, seven hundred twenty-one thousand, fifty".