7640428 has 6 divisors (see below), whose sum is σ = 13370756. Its totient is φ = 3820212.

The previous prime is 7640419. The next prime is 7640443. The reversal of 7640428 is 8240467.

It is a super-2 number, since 2×7640428² = 116752280046368, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7640428.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 955050 + ... + 955057.

Almost surely, 2^7640428 is an apocalyptic number.

It is an amenable number.

7640428 is a deficient number, since it is larger than the sum of its proper divisors (5730328).

7640428 is a wasteful number, since it uses less digits than its factorization.

7640428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1910111 (or 1910109 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 7640428 is about 2764.1324136155. The cubic root of 7640428 is about 196.9575178737.

It can be divided in two parts, 76404 and 28, that multiplied together give a palindrome (2139312).

The spelling of 7640428 in words is "seven million, six hundred forty thousand, four hundred twenty-eight".