7681428 has 36 divisors (see below), whose sum is σ = 20046208. Its totient is φ = 2477520.

The previous prime is 7681417. The next prime is 7681489. The reversal of 7681428 is 8241867.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×7681428² = 118008672238368, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 7681392 and 7681401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2326 + ... + 4557.

Almost surely, 2^7681428 is an apocalyptic number.

It is an amenable number.

7681428 is an abundant number, since it is smaller than the sum of its proper divisors (12364780).

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

7681428 is a wasteful number, since it uses less digits than its factorization.

7681428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6924 (or 6919 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 7681428 is about 2771.5389226926. The cubic root of 7681428 is about 197.3091934902.

The spelling of 7681428 in words is "seven million, six hundred eighty-one thousand, four hundred twenty-eight".