74640263 has 4 divisors (see below), whose sum is σ = 75210168. Its totient is φ = 74070360.

The previous prime is 74640259. The next prime is 74640283. The reversal of 74640263 is 36204647.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 36204647 = 1321 ⋅27407.

It is a cyclic number.

It is not a de Polignac number, because 74640263 - 2² = 74640259 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74640283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 284756 + ... + 285017.

It is an arithmetic number, because the mean of its divisors is an integer number (18802542).

Almost surely, 2^74640263 is an apocalyptic number.

74640263 is a deficient number, since it is larger than the sum of its proper divisors (569905).

74640263 is a wasteful number, since it uses less digits than its factorization.

74640263 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569904.

The product of its (nonzero) digits is 24192, while the sum is 32.

The square root of 74640263 is about 8639.4596474548. The cubic root of 74640263 is about 421.0409985594.

The spelling of 74640263 in words is "seventy-four million, six hundred forty thousand, two hundred sixty-three".