78774913 has 4 divisors (see below), whose sum is σ = 90028480. Its totient is φ = 67521348.

The previous prime is 78774911. The next prime is 78774919. The reversal of 78774913 is 31947787.

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: 31947787 = 1861 ⋅17167.

It is a cyclic number.

It is not a de Polignac number, because 78774913 - 2¹ = 78774911 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78774911) 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, 5626773 + ... + 5626786.

It is an arithmetic number, because the mean of its divisors is an integer number (22507120).

Almost surely, 2^78774913 is an apocalyptic number.

It is an amenable number.

78774913 is a deficient number, since it is larger than the sum of its proper divisors (11253567).

78774913 is a wasteful number, since it uses less digits than its factorization.

78774913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11253566.

The product of its digits is 296352, while the sum is 46.

The square root of 78774913 is about 8875.5232521807. The cubic root of 78774913 is about 428.6761392769.

The spelling of 78774913 in words is "seventy-eight million, seven hundred seventy-four thousand, nine hundred thirteen".