78280815604 has 12 divisors (see below), whose sum is σ = 137333054628. Its totient is φ = 39042800000.

The previous prime is 78280815577. The next prime is 78280815607. The reversal of 78280815604 is 40651808287.

It can be written as a sum of positive squares in 2 ways, for example, as 42993193104 + 35287622500 = 207348^2 + 187850^2 .

It is a super-2 number, since 2×78280815604² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78280815607) 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, 24400147 + ... + 24403354.

It is an arithmetic number, because the mean of its divisors is an integer number (11444421219).

Almost surely, 2^78280815604 is an apocalyptic number.

It is an amenable number.

78280815604 is a deficient number, since it is larger than the sum of its proper divisors (59052239024).

78280815604 is a wasteful number, since it uses less digits than its factorization.

78280815604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48803906 (or 48803904 counting only the distinct ones).

The product of its (nonzero) digits is 860160, while the sum is 49.

The spelling of 78280815604 in words is "seventy-eight billion, two hundred eighty million, eight hundred fifteen thousand, six hundred four".