72151977 has 4 divisors (see below), whose sum is σ = 96202640. Its totient is φ = 48101316.

The previous prime is 72151957. The next prime is 72151991. The reversal of 72151977 is 77915127.

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 not a de Polignac number, because 72151977 - 2¹¹ = 72149929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72151957) 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, 12025327 + ... + 12025332.

It is an arithmetic number, because the mean of its divisors is an integer number (24050660).

Almost surely, 2^72151977 is an apocalyptic number.

It is an amenable number.

72151977 is a deficient number, since it is larger than the sum of its proper divisors (24050663).

72151977 is a wasteful number, since it uses less digits than its factorization.

72151977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24050662.

The product of its digits is 30870, while the sum is 39.

The square root of 72151977 is about 8494.2319841172. The cubic root of 72151977 is about 416.3092671428.

The spelling of 72151977 in words is "seventy-two million, one hundred fifty-one thousand, nine hundred seventy-seven".