74428515 has 48 divisors (see below), whose sum is σ = 148145088. Its totient is φ = 33861888.

The previous prime is 74428493. The next prime is 74428517. The reversal of 74428515 is 51582447.

It is not a de Polignac number, because 74428515 - 2⁸ = 74428259 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 74428515.

It is not an unprimeable number, because it can be changed into a prime (74428517) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 86829 + ... + 87681.

It is an arithmetic number, because the mean of its divisors is an integer number (3086356).

Almost surely, 2^74428515 is an apocalyptic number.

74428515 is a deficient number, since it is larger than the sum of its proper divisors (73716573).

74428515 is a wasteful number, since it uses less digits than its factorization.

74428515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1148 (or 1145 counting only the distinct ones).

The product of its digits is 44800, while the sum is 36.

The square root of 74428515 is about 8627.1962421171. The cubic root of 74428515 is about 420.6424691023.

The spelling of 74428515 in words is "seventy-four million, four hundred twenty-eight thousand, five hundred fifteen".