71949645 has 48 divisors (see below), whose sum is σ = 129941760. Its totient is φ = 36796032.

The previous prime is 71949643. The next prime is 71949679. The reversal of 71949645 is 54694917.

It is not a de Polignac number, because 71949645 - 2¹ = 71949643 is a prime.

It is a super-3 number, since 3×71949645³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 71949645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71949643) 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, 131262 + ... + 131808.

It is an arithmetic number, because the mean of its divisors is an integer number (2707120).

Almost surely, 2^71949645 is an apocalyptic number.

It is an amenable number.

71949645 is a deficient number, since it is larger than the sum of its proper divisors (57992115).

71949645 is a wasteful number, since it uses less digits than its factorization.

71949645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 671 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 71949645 is about 8482.3136584307. The cubic root of 71949645 is about 415.9197580840.

The spelling of 71949645 in words is "seventy-one million, nine hundred forty-nine thousand, six hundred forty-five".