7721025 has 24 divisors (see below), whose sum is σ = 13749120. Its totient is φ = 3800640.

The previous prime is 7721023. The next prime is 7721029. The reversal of 7721025 is 5201277.

It is not a de Polignac number, because 7721025 - 2¹ = 7721023 is a prime.

It is a super-2 number, since 2×7721025² = 119228454101250, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7720986 and 7721004.

It is not an unprimeable number, because it can be changed into a prime (7721023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2985 + ... + 4934.

It is an arithmetic number, because the mean of its divisors is an integer number (572880).

Almost surely, 2^7721025 is an apocalyptic number.

7721025 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

7721025 is a deficient number, since it is larger than the sum of its proper divisors (6028095).

7721025 is a wasteful number, since it uses less digits than its factorization.

7721025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7945 (or 7940 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 7721025 is about 2778.6732445540. The cubic root of 7721025 is about 197.6476490318.

The spelling of 7721025 in words is "seven million, seven hundred twenty-one thousand, twenty-five".