78898549 has 4 divisors (see below), whose sum is σ = 79500960. Its totient is φ = 78296140.

The previous prime is 78898511. The next prime is 78898577. The reversal of 78898549 is 94589887.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78898549 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78898493 and 78898502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78898949) 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, 301009 + ... + 301270.

It is an arithmetic number, because the mean of its divisors is an integer number (19875240).

Almost surely, 2^78898549 is an apocalyptic number.

It is an amenable number.

78898549 is a deficient number, since it is larger than the sum of its proper divisors (602411).

78898549 is a wasteful number, since it uses less digits than its factorization.

78898549 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 602410.

The product of its digits is 5806080, while the sum is 58.

The square root of 78898549 is about 8882.4855192677. The cubic root of 78898549 is about 428.9002888944.

The spelling of 78898549 in words is "seventy-eight million, eight hundred ninety-eight thousand, five hundred forty-nine".