71224407 has 32 divisors (see below), whose sum is σ = 117619200. Its totient is φ = 42332544.

The previous prime is 71224381. The next prime is 71224423. The reversal of 71224407 is 70442217.

It is a happy number.

It is not a de Polignac number, because 71224407 - 2⁶ = 71224343 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71224477) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4638 + ... + 12804.

It is an arithmetic number, because the mean of its divisors is an integer number (3675600).

Almost surely, 2^71224407 is an apocalyptic number.

71224407 is a deficient number, since it is larger than the sum of its proper divisors (46394793).

71224407 is a wasteful number, since it uses less digits than its factorization.

71224407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8212 (or 8206 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 71224407 is about 8439.4553734231. The cubic root of 71224407 is about 414.5175736332.

It can be divided in two parts, 71224 and 407, that added together give a triangular number (71631 = T₃₇₈).

The spelling of 71224407 in words is "seventy-one million, two hundred twenty-four thousand, four hundred seven".