74878213 has 2 divisors, whose sum is σ = 74878214. Its totient is φ = 74878212.

The previous prime is 74878211. The next prime is 74878229. The reversal of 74878213 is 31287847.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74615044 + 263169 = 8638^2 + 513^2 .

It is a cyclic number.

It is not a de Polignac number, because 74878213 - 2¹ = 74878211 is a prime.

Together with 74878211, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74878211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37439106 + 37439107.

It is an arithmetic number, because the mean of its divisors is an integer number (37439107).

Almost surely, 2^74878213 is an apocalyptic number.

It is an amenable number.

74878213 is a deficient number, since it is larger than the sum of its proper divisors (1).

74878213 is an equidigital number, since it uses as much as digits as its factorization.

74878213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 40.

The square root of 74878213 is about 8653.2198053672. The cubic root of 74878213 is about 421.4879442429.

It can be divided in two parts, 748 and 78213, that added together give a square (78961 = 281²).

The spelling of 74878213 in words is "seventy-four million, eight hundred seventy-eight thousand, two hundred thirteen".