78348577 has 4 divisors (see below), whose sum is σ = 80015616. Its totient is φ = 76681540.

The previous prime is 78348559. The next prime is 78348587. The reversal of 78348577 is 77584387.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 77584387 = 2543 ⋅30509.

It is a cyclic number.

It is not a de Polignac number, because 78348577 - 2¹¹ = 78346529 is a prime.

It is a super-2 number, since 2×78348577² = 12276999035849858, which contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78348577.

It is not an unprimeable number, because it can be changed into a prime (78348547) 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, 833449 + ... + 833542.

It is an arithmetic number, because the mean of its divisors is an integer number (20003904).

Almost surely, 2^78348577 is an apocalyptic number.

It is an amenable number.

78348577 is a deficient number, since it is larger than the sum of its proper divisors (1667039).

78348577 is a wasteful number, since it uses less digits than its factorization.

78348577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1667038.

The product of its digits is 1317120, while the sum is 49.

The square root of 78348577 is about 8851.4731542269. The cubic root of 78348577 is about 427.9013969874.

The spelling of 78348577 in words is "seventy-eight million, three hundred forty-eight thousand, five hundred seventy-seven".