4638640078 has 16 divisors (see below), whose sum is σ = 7084152144. Its totient is φ = 2277475200.

The previous prime is 4638640073. The next prime is 4638640091. The reversal of 4638640078 is 8700468364.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4638640073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12123 + ... + 97078.

It is an arithmetic number, because the mean of its divisors is an integer number (442759509).

Almost surely, 2^4638640078 is an apocalyptic number.

4638640078 is a deficient number, since it is larger than the sum of its proper divisors (2445512066).

4638640078 is a wasteful number, since it uses less digits than its factorization.

4638640078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109587.

The product of its (nonzero) digits is 774144, while the sum is 46.

The square root of 4638640078 is about 68107.5625609961. The cubic root of 4638640078 is about 1667.7472197627.

The spelling of 4638640078 in words is "four billion, six hundred thirty-eight million, six hundred forty thousand, seventy-eight".