72145355 has 4 divisors (see below), whose sum is σ = 86574432. Its totient is φ = 57716280.

The previous prime is 72145351. The next prime is 72145361. The reversal of 72145355 is 55354127.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 72145355 - 2² = 72145351 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72145351) 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, 7214531 + ... + 7214540.

It is an arithmetic number, because the mean of its divisors is an integer number (21643608).

Almost surely, 2^72145355 is an apocalyptic number.

72145355 is a deficient number, since it is larger than the sum of its proper divisors (14429077).

72145355 is a wasteful number, since it uses less digits than its factorization.

72145355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14429076.

The product of its digits is 21000, while the sum is 32.

The square root of 72145355 is about 8493.8421812511. The cubic root of 72145355 is about 416.2965306736.

The spelling of 72145355 in words is "seventy-two million, one hundred forty-five thousand, three hundred fifty-five".