78272409 has 8 divisors (see below), whose sum is σ = 106132320. Its totient is φ = 51297056.

The previous prime is 78272407. The next prime is 78272431. The reversal of 78272409 is 90427287.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78272409 - 2¹ = 78272407 is a prime.

It is a super-2 number, since 2×78272409² = 12253140021326562, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78272407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 220932 + ... + 221285.

It is an arithmetic number, because the mean of its divisors is an integer number (13266540).

Almost surely, 2^78272409 is an apocalyptic number.

It is an amenable number.

78272409 is a deficient number, since it is larger than the sum of its proper divisors (27859911).

78272409 is a wasteful number, since it uses less digits than its factorization.

78272409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 442279.

The product of its (nonzero) digits is 56448, while the sum is 39.

The square root of 78272409 is about 8847.1695473750. The cubic root of 78272409 is about 427.7626879756.

The spelling of 78272409 in words is "seventy-eight million, two hundred seventy-two thousand, four hundred nine".