30640028 has 24 divisors (see below), whose sum is σ = 55910400. Its totient is φ = 14675760.

The previous prime is 30640019. The next prime is 30640087. The reversal of 30640028 is 82004603.

It is a happy number.

It is a super-2 number, since 2×30640028² = 1877622631681568, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 30639985 and 30640012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11573 + ... + 13971.

It is an arithmetic number, because the mean of its divisors is an integer number (2329600).

Almost surely, 2^30640028 is an apocalyptic number.

It is an amenable number.

30640028 is a deficient number, since it is larger than the sum of its proper divisors (25270372).

30640028 is a wasteful number, since it uses less digits than its factorization.

30640028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2537 (or 2535 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 30640028 is about 5535.3435304414. The cubic root of 30640028 is about 312.9174044670.

The spelling of 30640028 in words is "thirty million, six hundred forty thousand, twenty-eight".