71772461 has 4 divisors (see below), whose sum is σ = 73441632. Its totient is φ = 70103292.

The previous prime is 71772413. The next prime is 71772469. The reversal of 71772461 is 16427717.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71772461 - 2²² = 67578157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71772469) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834521 + ... + 834606.

It is an arithmetic number, because the mean of its divisors is an integer number (18360408).

Almost surely, 2^71772461 is an apocalyptic number.

It is an amenable number.

71772461 is a deficient number, since it is larger than the sum of its proper divisors (1669171).

71772461 is a wasteful number, since it uses less digits than its factorization.

71772461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1669170.

The product of its digits is 16464, while the sum is 35.

The square root of 71772461 is about 8471.8629002127. The cubic root of 71772461 is about 415.5780612264.

The spelling of 71772461 in words is "seventy-one million, seven hundred seventy-two thousand, four hundred sixty-one".