72378253 has 4 divisors (see below), whose sum is σ = 74334460. Its totient is φ = 70422048.

The previous prime is 72378233. The next prime is 72378283. The reversal of 72378253 is 35287327.

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

It can be written as a sum of positive squares in 2 ways, for example, as 66292164 + 6086089 = 8142^2 + 2467^2 .

It is a cyclic number.

It is not a de Polignac number, because 72378253 - 2⁵ = 72378221 is a prime.

It is a super-2 number, since 2×72378253² = 10477223014664018, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 1956169 = 72378253 / (7 + 2 + 3 + 7 + 8 + 2 + 5 + 3).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72378223) 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, 978048 + ... + 978121.

It is an arithmetic number, because the mean of its divisors is an integer number (18583615).

Almost surely, 2^72378253 is an apocalyptic number.

It is an amenable number.

72378253 is a deficient number, since it is larger than the sum of its proper divisors (1956207).

72378253 is a wasteful number, since it uses less digits than its factorization.

72378253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1956206.

The product of its digits is 70560, while the sum is 37.

The square root of 72378253 is about 8507.5409490640. The cubic root of 72378253 is about 416.7440091804.

The spelling of 72378253 in words is "seventy-two million, three hundred seventy-eight thousand, two hundred fifty-three".