7258121840 has 40 divisors (see below), whose sum is σ = 17088757440. Its totient is φ = 2866496256.

The previous prime is 7258121821. The next prime is 7258121861. The reversal of 7258121840 is 481218527.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 7258121794 and 7258121803.

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, 567899 + ... + 580538.

It is an arithmetic number, because the mean of its divisors is an integer number (427218936).

Almost surely, 2^7258121840 is an apocalyptic number.

It is an amenable number.

7258121840 is an abundant number, since it is smaller than the sum of its proper divisors (9830635600).

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

7258121840 is a wasteful number, since it uses less digits than its factorization.

7258121840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148529 (or 1148523 counting only the distinct ones).

The product of its (nonzero) digits is 35840, while the sum is 38.

The square root of 7258121840 is about 85194.6115666948. The cubic root of 7258121840 is about 1936.1607779756.

The spelling of 7258121840 in words is "seven billion, two hundred fifty-eight million, one hundred twenty-one thousand, eight hundred forty".