78622649 has 4 divisors (see below), whose sum is σ = 89854464. Its totient is φ = 67390836.

The previous prime is 78622573. The next prime is 78622651. The reversal of 78622649 is 94622687.

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: 94622687 = 8581 ⋅11027.

It is a cyclic number.

It is not a de Polignac number, because 78622649 - 2¹⁶ = 78557113 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78622699) 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, 5615897 + ... + 5615910.

It is an arithmetic number, because the mean of its divisors is an integer number (22463616).

Almost surely, 2^78622649 is an apocalyptic number.

It is an amenable number.

78622649 is a deficient number, since it is larger than the sum of its proper divisors (11231815).

78622649 is a wasteful number, since it uses less digits than its factorization.

78622649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11231814.

The product of its digits is 290304, while the sum is 44.

The square root of 78622649 is about 8866.9413553942. The cubic root of 78622649 is about 428.3997651492.

The spelling of 78622649 in words is "seventy-eight million, six hundred twenty-two thousand, six hundred forty-nine".