7278642 has 48 divisors (see below), whose sum is σ = 18338112. Its totient is φ = 2043360.

The previous prime is 7278641. The next prime is 7278643. The reversal of 7278642 is 2468727.

7278642 is a `hidden beast` number, since 7 + 2 + 7 + 8 + 642 = 666.

It is an interprime number because it is at equal distance from previous prime (7278641) and next prime (7278643).

It is a junction number, because it is equal to n+sod(n) for n = 7278597 and 7278606.

It is not an unprimeable number, because it can be changed into a prime (7278641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7213 + ... + 8159.

It is an arithmetic number, because the mean of its divisors is an integer number (382044).

Almost surely, 2^7278642 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7278642, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9169056).

7278642 is an abundant number, since it is smaller than the sum of its proper divisors (11059470).

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

7278642 is a wasteful number, since it uses less digits than its factorization.

7278642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1023 (or 1020 counting only the distinct ones).

The product of its digits is 37632, while the sum is 36.

The square root of 7278642 is about 2697.8958467665. The cubic root of 7278642 is about 193.7983698866.

The spelling of 7278642 in words is "seven million, two hundred seventy-eight thousand, six hundred forty-two".