71604975 has 36 divisors (see below), whose sum is σ = 127965768. Its totient is φ = 35121600.

The previous prime is 71604971. The next prime is 71604979. The reversal of 71604975 is 57940617.

It is an interprime number because it is at equal distance from previous prime (71604971) and next prime (71604979).

It is not a de Polignac number, because 71604975 - 2² = 71604971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71604971) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 264090 + ... + 264360.

Almost surely, 2^71604975 is an apocalyptic number.

71604975 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

71604975 is a deficient number, since it is larger than the sum of its proper divisors (56360793).

71604975 is a wasteful number, since it uses less digits than its factorization.

71604975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 568 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 39.

The square root of 71604975 is about 8461.9722878298. The cubic root of 71604975 is about 415.2545494039.

Multiplying 71604975 by its sum of digits (39), we get a square (2792594025 = 52845²).

71604975 divided by its sum of digits (39) gives a square (1836025 = 1355²).

The spelling of 71604975 in words is "seventy-one million, six hundred four thousand, nine hundred seventy-five".