77881444890 has 16 divisors (see below), whose sum is σ = 186915467808. Its totient is φ = 20768385296.

The previous prime is 77881444859. The next prime is 77881444903. The reversal of 77881444890 is 9844418877.

It is a super-2 number, since 2×77881444890² (a number of 23 digits) contains 22 as substring.

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, 1298024052 + ... + 1298024111.

It is an arithmetic number, because the mean of its divisors is an integer number (11682216738).

Almost surely, 2^77881444890 is an apocalyptic number.

77881444890 is an abundant number, since it is smaller than the sum of its proper divisors (109034022918).

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

77881444890 is a wasteful number, since it uses less digits than its factorization.

77881444890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2596048173.

The product of its (nonzero) digits is 14450688, while the sum is 60.

The spelling of 77881444890 in words is "seventy-seven billion, eight hundred eighty-one million, four hundred forty-four thousand, eight hundred ninety".