78420362124 has 96 divisors (see below), whose sum is σ = 198495566080. Its totient is φ = 23953708800.

The previous prime is 78420362107. The next prime is 78420362147. The reversal of 78420362124 is 42126302487.

It is a happy number.

It is a super-2 number, since 2×78420362124² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13854807 + ... + 13860465.

Almost surely, 2^78420362124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78420362124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99247783040).

78420362124 is an abundant number, since it is smaller than the sum of its proper divisors (120075203956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78420362124 is a wasteful number, since it uses less digits than its factorization.

78420362124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6311 (or 6309 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 39.

The spelling of 78420362124 in words is "seventy-eight billion, four hundred twenty million, three hundred sixty-two thousand, one hundred twenty-four".