78251309430 has 192 divisors, whose sum is σ = 227516179968. Its totient is φ = 16870394880.

The previous prime is 78251309369. The next prime is 78251309441. The reversal of 78251309430 is 3490315287.

It is a super-2 number, since 2×78251309430² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 18268069 + ... + 18272351.

It is an arithmetic number, because the mean of its divisors is an integer number (1184980104).

Almost surely, 2^78251309430 is an apocalyptic number.

78251309430 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 78251309430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113758089984).

78251309430 is an abundant number, since it is smaller than the sum of its proper divisors (149264870538).

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

78251309430 is a wasteful number, since it uses less digits than its factorization.

78251309430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4579 (or 4560 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 42.

The spelling of 78251309430 in words is "seventy-eight billion, two hundred fifty-one million, three hundred nine thousand, four hundred thirty".