2478031978 has 16 divisors (see below), whose sum is σ = 3799080000. Its totient is φ = 1211883552.

The previous prime is 2478031967. The next prime is 2478031987. The reversal of 2478031978 is 8791308742.

2478031978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×2478031978² = 12281284967981184968, which contains 22 as substring.

2478031978 is a modest number, since divided by 31978 gives 24780 as remainder.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29283 + ... + 76246.

It is an arithmetic number, because the mean of its divisors is an integer number (237442500).

Almost surely, 2^2478031978 is an apocalyptic number.

2478031978 is a deficient number, since it is larger than the sum of its proper divisors (1321048022).

2478031978 is a wasteful number, since it uses less digits than its factorization.

2478031978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105789.

The product of its (nonzero) digits is 677376, while the sum is 49.

The square root of 2478031978 is about 49779.8350539654. The cubic root of 2478031978 is about 1353.2217479537.

The spelling of 2478031978 in words is "two billion, four hundred seventy-eight million, thirty-one thousand, nine hundred seventy-eight".