7256739840 has 416 divisors, whose sum is σ = 27175772160. Its totient is φ = 1618870272.

The previous prime is 7256739839. The next prime is 7256739851. The reversal of 7256739840 is 489376527.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20213581 + ... + 20213939.

Almost surely, 2^7256739840 is an apocalyptic number.

7256739840 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7256739840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13587886080).

7256739840 is an abundant number, since it is smaller than the sum of its proper divisors (19919032320).

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

7256739840 is a wasteful number, since it uses less digits than its factorization.

7256739840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 445 (or 423 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 51.

The square root of 7256739840 is about 85186.5003389622. The cubic root of 7256739840 is about 1936.0378837383.

The spelling of 7256739840 in words is "seven billion, two hundred fifty-six million, seven hundred thirty-nine thousand, eight hundred forty".