78402534824 has 8 divisors (see below), whose sum is σ = 147004752810. Its totient is φ = 39201267408.

The previous prime is 78402534823. The next prime is 78402534851. The reversal of 78402534824 is 42843520487.

It can be written as a sum of positive squares in only one way, i.e., 74556302500 + 3846232324 = 273050^2 + 62018^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×78402534824² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78402534823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4900158419 + ... + 4900158434.

Almost surely, 2^78402534824 is an apocalyptic number.

It is an amenable number.

78402534824 is a deficient number, since it is larger than the sum of its proper divisors (68602217986).

78402534824 is a wasteful number, since it uses less digits than its factorization.

78402534824 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9800316859 (or 9800316855 counting only the distinct ones).

The product of its (nonzero) digits is 1720320, while the sum is 47.

The spelling of 78402534824 in words is "seventy-eight billion, four hundred two million, five hundred thirty-four thousand, eight hundred twenty-four".