7638618 has 16 divisors (see below), whose sum is σ = 16452576. Its totient is φ = 2350320.

The previous prime is 7638601. The next prime is 7638619. The reversal of 7638618 is 8168367.

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 (7638619) 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, 48888 + ... + 49043.

It is an arithmetic number, because the mean of its divisors is an integer number (1028286).

Almost surely, 2^7638618 is an apocalyptic number.

7638618 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

7638618 is an abundant number, since it is smaller than the sum of its proper divisors (8813958).

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

7638618 is a wasteful number, since it uses less digits than its factorization.

7638618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97949.

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

The square root of 7638618 is about 2763.8049858845. The cubic root of 7638618 is about 196.9419637162.

It can be divided in two parts, 7638 and 618, that added together give a triangular number (8256 = T₁₂₈).

The spelling of 7638618 in words is "seven million, six hundred thirty-eight thousand, six hundred eighteen".