77121310 has 16 divisors (see below), whose sum is σ = 158649696. Its totient is φ = 26441568.

The previous prime is 77121271. The next prime is 77121311. The reversal of 77121310 is 1312177.

It is a super-2 number, since 2×77121310² = 11895392912232200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77121311) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 550797 + ... + 550936.

It is an arithmetic number, because the mean of its divisors is an integer number (9915606).

Almost surely, 2^77121310 is an apocalyptic number.

77121310 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

77121310 is an abundant number, since it is smaller than the sum of its proper divisors (81528386).

77121310 is a wasteful number, since it uses less digits than its factorization.

77121310 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1101747.

The product of its (nonzero) digits is 294, while the sum is 22.

The square root of 77121310 is about 8781.8739458045. The cubic root of 77121310 is about 425.6553855915.

Adding to 77121310 its reverse (1312177), we get a palindrome (78433487).

The spelling of 77121310 in words is "seventy-seven million, one hundred twenty-one thousand, three hundred ten".