77223571440 has 40 divisors (see below), whose sum is σ = 239393072208. Its totient is φ = 20592952320.

The previous prime is 77223571433. The next prime is 77223571441. The reversal of 77223571440 is 4417532277.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 77223571392 and 77223571401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77223571441) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160882201 + ... + 160882680.

Almost surely, 2^77223571440 is an apocalyptic number.

It is an amenable number.

77223571440 is an abundant number, since it is smaller than the sum of its proper divisors (162169500768).

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

77223571440 is a wasteful number, since it uses less digits than its factorization.

77223571440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321764897 (or 321764891 counting only the distinct ones).

The product of its (nonzero) digits is 329280, while the sum is 42.

The spelling of 77223571440 in words is "seventy-seven billion, two hundred twenty-three million, five hundred seventy-one thousand, four hundred forty".