30777698640 has 120 divisors (see below), whose sum is σ = 103314860640. Its totient is φ = 7576038912.

The previous prime is 30777698621. The next prime is 30777698647. The reversal of 30777698640 is 4689677703.

It is a tau number, because it is divible by the number of its divisors (120).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30777698647) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 338850 + ... + 419969.

It is an arithmetic number, because the mean of its divisors is an integer number (860957172).

Almost surely, 2^30777698640 is an apocalyptic number.

30777698640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

30777698640 is an abundant number, since it is smaller than the sum of its proper divisors (72537162000).

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

30777698640 is a wasteful number, since it uses less digits than its factorization.

30777698640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758861 (or 758842 counting only the distinct ones).

The product of its (nonzero) digits is 10668672, while the sum is 57.

The spelling of 30777698640 in words is "thirty billion, seven hundred seventy-seven million, six hundred ninety-eight thousand, six hundred forty".