78343650 has 432 divisors, whose sum is σ = 297704160. Its totient is φ = 14515200.

The previous prime is 78343649. The next prime is 78343651. The reversal of 78343650 is 5634387.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78343649) and next prime (78343651).

It is a super-2 number, since 2×78343650² = 12275454990645000, which contains 22 as substring.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (78343651) by changing a digit.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 4123341 + ... + 4123359.

It is an arithmetic number, because the mean of its divisors is an integer number (689130).

Almost surely, 2^78343650 is an apocalyptic number.

78343650 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 78343650, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (148852080).

78343650 is an abundant number, since it is smaller than the sum of its proper divisors (219360510).

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

78343650 is a wasteful number, since it uses less digits than its factorization.

78343650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79 (or 64 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 36.

The square root of 78343650 is about 8851.1948345972. The cubic root of 78343650 is about 427.8924271823.

The spelling of 78343650 in words is "seventy-eight million, three hundred forty-three thousand, six hundred fifty".