72101977 has 4 divisors (see below), whose sum is σ = 72152080. Its totient is φ = 72051876.

The previous prime is 72101971. The next prime is 72101993. The reversal of 72101977 is 77910127.

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 72101977 - 2³ = 72101969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72101971) 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, 22827 + ... + 25792.

It is an arithmetic number, because the mean of its divisors is an integer number (18038020).

Almost surely, 2^72101977 is an apocalyptic number.

It is an amenable number.

72101977 is a deficient number, since it is larger than the sum of its proper divisors (50103).

72101977 is a wasteful number, since it uses less digits than its factorization.

72101977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50102.

The product of its (nonzero) digits is 6174, while the sum is 34.

The square root of 72101977 is about 8491.2883003700. The cubic root of 72101977 is about 416.2130800189.

The spelling of 72101977 in words is "seventy-two million, one hundred one thousand, nine hundred seventy-seven".