78513700 has 108 divisors (see below), whose sum is σ = 189623280. Its totient is φ = 28123200.

The previous prime is 78513691. The next prime is 78513709. The reversal of 78513700 is 731587.

It is an interprime number because it is at equal distance from previous prime (78513691) and next prime (78513709).

It is a Harshad number since it is a multiple of its sum of digits (31).

It is not an unprimeable number, because it can be changed into a prime (78513709) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1825879 + ... + 1825921.

Almost surely, 2^78513700 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 78513700, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94811640).

78513700 is an abundant number, since it is smaller than the sum of its proper divisors (111109580).

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

78513700 is a wasteful number, since it uses less digits than its factorization.

78513700 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 100 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 78513700 is about 8860.7956753330. The cubic root of 78513700 is about 428.2017929273.

The spelling of 78513700 in words is "seventy-eight million, five hundred thirteen thousand, seven hundred".