77020717074 has 128 divisors (see below), whose sum is σ = 182690906112. Its totient is φ = 21189081600.

The previous prime is 77020717073. The next prime is 77020717087. The reversal of 77020717074 is 47071702077.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (77020717073) 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 63 ways as a sum of consecutive naturals, for example, 89872054 + ... + 89872910.

It is an arithmetic number, because the mean of its divisors is an integer number (1427272704).

Almost surely, 2^77020717074 is an apocalyptic number.

77020717074 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 77020717074, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91345453056).

77020717074 is an abundant number, since it is smaller than the sum of its proper divisors (105670189038).

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

77020717074 is a wasteful number, since it uses less digits than its factorization.

77020717074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1440.

The product of its (nonzero) digits is 134456, while the sum is 42.

The spelling of 77020717074 in words is "seventy-seven billion, twenty million, seven hundred seventeen thousand, seventy-four".