30640882878 has 64 divisors (see below), whose sum is σ = 69068116800. Its totient is φ = 10067932800.

The previous prime is 30640882871. The next prime is 30640882879. The reversal of 30640882878 is 87828804603.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30640882871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1236700 + ... + 1261232.

It is an arithmetic number, because the mean of its divisors is an integer number (1079189325).

Almost surely, 2^30640882878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30640882878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34534058400).

30640882878 is an abundant number, since it is smaller than the sum of its proper divisors (38427233922).

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

30640882878 is a wasteful number, since it uses less digits than its factorization.

30640882878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24874 (or 24868 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 54.

The spelling of 30640882878 in words is "thirty billion, six hundred forty million, eight hundred eighty-two thousand, eight hundred seventy-eight".