71653642 has 16 divisors (see below), whose sum is σ = 109089000. Its totient is φ = 35294400.

The previous prime is 71653613. The next prime is 71653643. The reversal of 71653642 is 24635617.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 71216721 + 436921 = 8439^2 + 661^2 .

It is a junction number, because it is equal to n+sod(n) for n = 71653598 and 71653607.

It is not an unprimeable number, because it can be changed into a prime (71653643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45484 + ... + 47032.

Almost surely, 2^71653642 is an apocalyptic number.

71653642 is a deficient number, since it is larger than the sum of its proper divisors (37435358).

71653642 is a wasteful number, since it uses less digits than its factorization.

71653642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881.

The product of its digits is 30240, while the sum is 34.

The square root of 71653642 is about 8464.8474292216. The cubic root of 71653642 is about 415.3486053286.

The spelling of 71653642 in words is "seventy-one million, six hundred fifty-three thousand, six hundred forty-two".