78143970 has 16 divisors (see below), whose sum is σ = 187545600. Its totient is φ = 20838384.

The previous prime is 78143969. The next prime is 78143971. The reversal of 78143970 is 7934187.

It is an interprime number because it is at equal distance from previous prime (78143969) and next prime (78143971).

It is a super-2 number, since 2×78143970² = 12212960094721800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78143971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1302370 + ... + 1302429.

It is an arithmetic number, because the mean of its divisors is an integer number (11721600).

Almost surely, 2^78143970 is an apocalyptic number.

78143970 is an abundant number, since it is smaller than the sum of its proper divisors (109401630).

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

78143970 is a wasteful number, since it uses less digits than its factorization.

78143970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2604809.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 78143970 is about 8839.9078049491. The cubic root of 78143970 is about 427.5285846623.

The spelling of 78143970 in words is "seventy-eight million, one hundred forty-three thousand, nine hundred seventy".