78330428 has 24 divisors (see below), whose sum is σ = 154366464. Its totient is φ = 34455600.

The previous prime is 78330419. The next prime is 78330431. The reversal of 78330428 is 82403387.

It is a super-2 number, since 2×78330428² = 12271311901326368, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

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, 27350 + ... + 30077.

It is an arithmetic number, because the mean of its divisors is an integer number (6431936).

Almost surely, 2^78330428 is an apocalyptic number.

It is an amenable number.

78330428 is a deficient number, since it is larger than the sum of its proper divisors (76036036).

78330428 is a wasteful number, since it uses less digits than its factorization.

78330428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57473 (or 57471 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 35.

The square root of 78330428 is about 8850.4478982705. The cubic root of 78330428 is about 427.8683541316.

The spelling of 78330428 in words is "seventy-eight million, three hundred thirty thousand, four hundred twenty-eight".