78240870 has 64 divisors (see below), whose sum is σ = 209926080. Its totient is φ = 20736000.

The previous prime is 78240859. The next prime is 78240881. The reversal of 78240870 is 7804287.

It is an interprime number because it is at equal distance from previous prime (78240859) and next prime (78240881).

It is a super-2 number, since 2×78240870² = 12243267476713800, which contains 22 as substring.

It is a congruent number.

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, 48070 + ... + 49670.

It is an arithmetic number, because the mean of its divisors is an integer number (3280095).

Almost surely, 2^78240870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78240870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104963040).

78240870 is an abundant number, since it is smaller than the sum of its proper divisors (131685210).

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

78240870 is a wasteful number, since it uses less digits than its factorization.

78240870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1798 (or 1792 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 78240870 is about 8845.3869333116. The cubic root of 78240870 is about 427.7052261784.

The spelling of 78240870 in words is "seventy-eight million, two hundred forty thousand, eight hundred seventy".