77721336490 has 32 divisors (see below), whose sum is σ = 160233813504. Its totient is φ = 26588995200.

The previous prime is 77721336439. The next prime is 77721336499. The reversal of 77721336490 is 9463312777.

It is a super-2 number, since 2×77721336490² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77721336499) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1182786 + ... + 1246765.

It is an arithmetic number, because the mean of its divisors is an integer number (5007306672).

Almost surely, 2^77721336490 is an apocalyptic number.

77721336490 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

77721336490 is an abundant number, since it is smaller than the sum of its proper divisors (82512477014).

77721336490 is a wasteful number, since it uses less digits than its factorization.

77721336490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2430022.

The product of its (nonzero) digits is 1333584, while the sum is 49.

The spelling of 77721336490 in words is "seventy-seven billion, seven hundred twenty-one million, three hundred thirty-six thousand, four hundred ninety".