2478978 has 32 divisors (see below), whose sum is σ = 5702400. Its totient is φ = 797328.

The previous prime is 2478953. The next prime is 2478997. The reversal of 2478978 is 8798742.

It is a super-2 number, since 2×2478978² = 12290663848968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 775 + ... + 2357.

It is an arithmetic number, because the mean of its divisors is an integer number (178200).

2^2478978 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2478978, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2851200).

2478978 is an abundant number, since it is smaller than the sum of its proper divisors (3223422).

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

2478978 is a wasteful number, since it uses less digits than its factorization.

2478978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623 (or 1617 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 2478978 is about 1574.4770560411. The cubic root of 2478978 is about 135.3393929572.

The spelling of 2478978 in words is "two million, four hundred seventy-eight thousand, nine hundred seventy-eight".