7278397290 has 64 divisors (see below), whose sum is σ = 19430841600. Its totient is φ = 1938727872.

The previous prime is 7278397267. The next prime is 7278397297. The reversal of 7278397290 is 927938727.

It is a super-2 number, since 2×7278397290² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (7278397297) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 233464 + ... + 262796.

It is an arithmetic number, because the mean of its divisors is an integer number (303606900).

Almost surely, 2^7278397290 is an apocalyptic number.

7278397290 is an abundant number, since it is smaller than the sum of its proper divisors (12152444310).

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

7278397290 is a wasteful number, since it uses less digits than its factorization.

7278397290 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30268 (or 30262 counting only the distinct ones).

The product of its (nonzero) digits is 2667168, while the sum is 54.

The square root of 7278397290 is about 85313.5234883661. The cubic root of 7278397290 is about 1937.9619801032.

The spelling of 7278397290 in words is "seven billion, two hundred seventy-eight million, three hundred ninety-seven thousand, two hundred ninety".