7721252 has 72 divisors (see below), whose sum is σ = 17696448. Its totient is φ = 2882880.

The previous prime is 7721251. The next prime is 7721267. The reversal of 7721252 is 2521277.

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (7721251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 145658 + ... + 145710.

It is an arithmetic number, because the mean of its divisors is an integer number (245784).

Almost surely, 2^7721252 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7721252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (8848224).

7721252 is an abundant number, since it is smaller than the sum of its proper divisors (9975196).

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

7721252 is a wasteful number, since it uses less digits than its factorization.

7721252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 116 counting only the distinct ones).

The product of its digits is 1960, while the sum is 26.

The square root of 7721252 is about 2778.7140910860. The cubic root of 7721252 is about 197.6495859757.

The spelling of 7721252 in words is "seven million, seven hundred twenty-one thousand, two hundred fifty-two".