72049378 has 4 divisors (see below), whose sum is σ = 108074070. Its totient is φ = 36024688.

The previous prime is 72049339. The next prime is 72049379. The reversal of 72049378 is 87394027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87394027 = 7 ⋅12484861.

It can be written as a sum of positive squares in only one way, i.e., 71520849 + 528529 = 8457^2 + 727^2 .

It is a super-2 number, since 2×72049378² = 10382225740373768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 72049378.

It is not an unprimeable number, because it can be changed into a prime (72049379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18012343 + ... + 18012346.

Almost surely, 2^72049378 is an apocalyptic number.

72049378 is a deficient number, since it is larger than the sum of its proper divisors (36024692).

72049378 is a wasteful number, since it uses less digits than its factorization.

72049378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36024691.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 72049378 is about 8488.1905021035. The cubic root of 72049378 is about 416.1118450809. Note that the first 3 decimals are identical.

It can be divided in two parts, 72049 and 378, that added together give a palindrome (72427).

The spelling of 72049378 in words is "seventy-two million, forty-nine thousand, three hundred seventy-eight".