2978386642 has 32 divisors (see below), whose sum is σ = 5594572800. Its totient is φ = 1155284880.

The previous prime is 2978386637. The next prime is 2978386643. The reversal of 2978386642 is 2466838792.

It is not an unprimeable number, because it can be changed into a prime (2978386643) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7642 + ... + 77557.

It is an arithmetic number, because the mean of its divisors is an integer number (174830400).

Almost surely, 2^2978386642 is an apocalyptic number.

2978386642 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

2978386642 is a deficient number, since it is larger than the sum of its proper divisors (2616186158).

2978386642 is a wasteful number, since it uses less digits than its factorization.

2978386642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85446.

The product of its digits is 6967296, while the sum is 55.

The square root of 2978386642 is about 54574.5970392819. The cubic root of 2978386642 is about 1438.7776796323. Note that the first 3 decimals are identical.

The spelling of 2978386642 in words is "two billion, nine hundred seventy-eight million, three hundred eighty-six thousand, six hundred forty-two".