71977923 has 8 divisors (see below), whose sum is σ = 106634000. Its totient is φ = 47985264.

The previous prime is 71977921. The next prime is 71977973. The reversal of 71977923 is 32977917.

It is not a de Polignac number, because 71977923 - 2¹ = 71977921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71977921) 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, 1332898 + ... + 1332951.

It is an arithmetic number, because the mean of its divisors is an integer number (13329250).

Almost surely, 2^71977923 is an apocalyptic number.

71977923 is a deficient number, since it is larger than the sum of its proper divisors (34656077).

71977923 is a wasteful number, since it uses less digits than its factorization.

71977923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2665858 (or 2665852 counting only the distinct ones).

The product of its digits is 166698, while the sum is 45.

The square root of 71977923 is about 8483.9803748005. The cubic root of 71977923 is about 415.9742398836.

It can be divided in two parts, 71977 and 923, that added together give a square (72900 = 270²).

The spelling of 71977923 in words is "seventy-one million, nine hundred seventy-seven thousand, nine hundred twenty-three".