78428974 has 16 divisors (see below), whose sum is σ = 130118688. Its totient is φ = 35219232.

The previous prime is 78428971. The next prime is 78428989. The reversal of 78428974 is 47982487.

It is a super-2 number, since 2×78428974² = 12302207925385352, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78428971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39802 + ... + 41725.

It is an arithmetic number, because the mean of its divisors is an integer number (8132418).

Almost surely, 2^78428974 is an apocalyptic number.

78428974 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

78428974 is a deficient number, since it is larger than the sum of its proper divisors (51689714).

78428974 is a wasteful number, since it uses less digits than its factorization.

78428974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81579.

The product of its digits is 903168, while the sum is 49.

The square root of 78428974 is about 8856.0134372075. The cubic root of 78428974 is about 428.0477099114.

The spelling of 78428974 in words is "seventy-eight million, four hundred twenty-eight thousand, nine hundred seventy-four".