7621428 has 12 divisors (see below), whose sum is σ = 17783360. Its totient is φ = 2540472.

The previous prime is 7621421. The next prime is 7621433. The reversal of 7621428 is 8241267.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 7621395 and 7621404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7621421) 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 3 ways as a sum of consecutive naturals, for example, 317548 + ... + 317571.

Almost surely, 2^7621428 is an apocalyptic number.

It is an amenable number.

7621428 is an abundant number, since it is smaller than the sum of its proper divisors (10161932).

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

7621428 is a wasteful number, since it uses less digits than its factorization.

7621428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 635126 (or 635124 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 7621428 is about 2760.6933911610. The cubic root of 7621428 is about 196.7941195612.

The spelling of 7621428 in words is "seven million, six hundred twenty-one thousand, four hundred twenty-eight".