71503947 has 12 divisors (see below), whose sum is σ = 103392640. Its totient is φ = 47618928.

The previous prime is 71503933. The next prime is 71503951. The reversal of 71503947 is 74930517.

It is a happy number.

It is not a de Polignac number, because 71503947 - 2¹⁸ = 71241803 is a prime.

It is a super-2 number, since 2×71503947² = 10225628873157618, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71503907) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6129 + ... + 13437.

Almost surely, 2^71503947 is an apocalyptic number.

71503947 is a deficient number, since it is larger than the sum of its proper divisors (31888693).

71503947 is a wasteful number, since it uses less digits than its factorization.

71503947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8402 (or 8399 counting only the distinct ones).

The product of its (nonzero) digits is 26460, while the sum is 36.

The square root of 71503947 is about 8456.0006504257. Note that the first 3 decimals coincide. The cubic root of 71503947 is about 415.0591622240.

The spelling of 71503947 in words is "seventy-one million, five hundred three thousand, nine hundred forty-seven".