7124721825 has 48 divisors (see below), whose sum is σ = 12771057600. Its totient is φ = 3483943680.

The previous prime is 7124721803. The next prime is 7124721829. The reversal of 7124721825 is 5281274217.

It is not a de Polignac number, because 7124721825 - 2¹⁶ = 7124656289 is a prime.

It is a super-2 number, since 2×7124721825² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7124721829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 120754 + ... + 169796.

It is an arithmetic number, because the mean of its divisors is an integer number (266063700).

Almost surely, 2^7124721825 is an apocalyptic number.

7124721825 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

7124721825 is a deficient number, since it is larger than the sum of its proper divisors (5646335775).

7124721825 is a wasteful number, since it uses less digits than its factorization.

7124721825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49218 (or 49213 counting only the distinct ones).

The product of its digits is 62720, while the sum is 39.

The square root of 7124721825 is about 84408.0672980966. The cubic root of 7124721825 is about 1924.2255230481.

The spelling of 7124721825 in words is "seven billion, one hundred twenty-four million, seven hundred twenty-one thousand, eight hundred twenty-five".