30681372780 has 120 divisors (see below), whose sum is σ = 96592557600. Its totient is φ = 8152462080.

The previous prime is 30681372769. The next prime is 30681372791. The reversal of 30681372780 is 8727318603.

It is an interprime number because it is at equal distance from previous prime (30681372769) and next prime (30681372791).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 421521 + ... + 488919.

It is an arithmetic number, because the mean of its divisors is an integer number (804937980).

Almost surely, 2^30681372780 is an apocalyptic number.

30681372780 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30681372780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48296278800).

30681372780 is an abundant number, since it is smaller than the sum of its proper divisors (65911184820).

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

30681372780 is a wasteful number, since it uses less digits than its factorization.

30681372780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67701 (or 67690 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 30681372780 in words is "thirty billion, six hundred eighty-one million, three hundred seventy-two thousand, seven hundred eighty".