72149446 has 4 divisors (see below), whose sum is σ = 108224172. Its totient is φ = 36074722.

The previous prime is 72149437. The next prime is 72149447. The reversal of 72149446 is 64494127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64494127 = 6791 ⋅9497.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72149447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18037360 + ... + 18037363.

It is an arithmetic number, because the mean of its divisors is an integer number (27056043).

Almost surely, 2^72149446 is an apocalyptic number.

72149446 is a deficient number, since it is larger than the sum of its proper divisors (36074726).

72149446 is a wasteful number, since it uses less digits than its factorization.

72149446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36074725.

The product of its digits is 48384, while the sum is 37.

The square root of 72149446 is about 8494.0829993590. The cubic root of 72149446 is about 416.3043992186.

The spelling of 72149446 in words is "seventy-two million, one hundred forty-nine thousand, four hundred forty-six".