78241779 has 54 divisors (see below), whose sum is σ = 144557244. Its totient is φ = 40325040.

The previous prime is 78241759. The next prime is 78241783. The reversal of 78241779 is 97714287.

It is a happy number.

It is not a de Polignac number, because 78241779 - 2⁷ = 78241651 is a prime.

It is a super-2 number, since 2×78241779² = 12243551962169682, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78241759) by changing a digit.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 616014 + ... + 616140.

It is an arithmetic number, because the mean of its divisors is an integer number (2676986).

Almost surely, 2^78241779 is an apocalyptic number.

78241779 is a deficient number, since it is larger than the sum of its proper divisors (66315465).

78241779 is a wasteful number, since it uses less digits than its factorization.

78241779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285 (or 148 counting only the distinct ones).

The product of its digits is 197568, while the sum is 45.

The square root of 78241779 is about 8845.4383158779. The cubic root of 78241779 is about 427.7068825273.

The spelling of 78241779 in words is "seventy-eight million, two hundred forty-one thousand, seven hundred seventy-nine".