30278640 has 160 divisors (see below), whose sum is σ = 109278720. Its totient is φ = 6792192.

The previous prime is 30278569. The next prime is 30278663. The reversal of 30278640 is 4687203.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a zygodrome in base 2.

It is a junction number, because it is equal to n+sod(n) for n = 30278598 and 30278607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 112426 + ... + 112694.

It is an arithmetic number, because the mean of its divisors is an integer number (682992).

Almost surely, 2^30278640 is an apocalyptic number.

30278640 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 30278640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54639360).

30278640 is an abundant number, since it is smaller than the sum of its proper divisors (79000080).

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

30278640 is a wasteful number, since it uses less digits than its factorization.

30278640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359 (or 353 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 30.

The square root of 30278640 is about 5502.6030203895. The cubic root of 30278640 is about 311.6822867035.

The spelling of 30278640 in words is "thirty million, two hundred seventy-eight thousand, six hundred forty".