77773236540 has 24 divisors (see below), whose sum is σ = 217765062480. Its totient is φ = 20739529728.

The previous prime is 77773236533. The next prime is 77773236557. The reversal of 77773236540 is 4563237777.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 648110245 + ... + 648110364.

It is an arithmetic number, because the mean of its divisors is an integer number (9073544270).

Almost surely, 2^77773236540 is an apocalyptic number.

It is an amenable number.

77773236540 is an abundant number, since it is smaller than the sum of its proper divisors (139991825940).

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

77773236540 is a wasteful number, since it uses less digits than its factorization.

77773236540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296220621 (or 1296220619 counting only the distinct ones).

The product of its (nonzero) digits is 5186160, while the sum is 51.

The spelling of 77773236540 in words is "seventy-seven billion, seven hundred seventy-three million, two hundred thirty-six thousand, five hundred forty".