7278740 has 24 divisors (see below), whose sum is σ = 17469312. Its totient is φ = 2495520.

The previous prime is 7278727. The next prime is 7278773. The reversal of 7278740 is 478727.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 7278740.

It is a congruent number.

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, 25856 + ... + 26135.

It is an arithmetic number, because the mean of its divisors is an integer number (727888).

Almost surely, 2^7278740 is an apocalyptic number.

7278740 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

7278740 is an abundant number, since it is smaller than the sum of its proper divisors (10190572).

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

7278740 is a wasteful number, since it uses less digits than its factorization.

7278740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52007 (or 52005 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 35.

The square root of 7278740 is about 2697.9140090077. The cubic root of 7278740 is about 193.7992396530.

It can be divided in two parts, 72787 and 40, that added together give a palindrome (72827).

The spelling of 7278740 in words is "seven million, two hundred seventy-eight thousand, seven hundred forty".