30478890 has 64 divisors (see below), whose sum is σ = 81349632. Its totient is φ = 7257600.

The previous prime is 30478883. The next prime is 30478891. The reversal of 30478890 is 9887403.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (30478891) 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, 10830 + ... + 13350.

It is an arithmetic number, because the mean of its divisors is an integer number (1271088).

Almost surely, 2^30478890 is an apocalyptic number.

30478890 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 30478890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40674816).

30478890 is an abundant number, since it is smaller than the sum of its proper divisors (50870742).

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

30478890 is a wasteful number, since it uses less digits than its factorization.

30478890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2575.

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 30478890 is about 5520.7689681783. The cubic root of 30478890 is about 312.3678886903.

The spelling of 30478890 in words is "thirty million, four hundred seventy-eight thousand, eight hundred ninety".