78142780 has 24 divisors (see below), whose sum is σ = 164334240. Its totient is φ = 31212480.

The previous prime is 78142747. The next prime is 78142783. The reversal of 78142780 is 8724187.

It is a super-2 number, since 2×78142780² = 12212588132256800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78142783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14041 + ... + 18799.

It is an arithmetic number, because the mean of its divisors is an integer number (6847260).

Almost surely, 2^78142780 is an apocalyptic number.

It is an amenable number.

78142780 is an abundant number, since it is smaller than the sum of its proper divisors (86191460).

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

78142780 is a wasteful number, since it uses less digits than its factorization.

78142780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5589 (or 5587 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 37.

The square root of 78142780 is about 8839.8404962986. The cubic root of 78142780 is about 427.5264144731.

It can be divided in two parts, 78 and 142780, that multiplied together give a triangular number (11136840 = T₄₇₁₉).

The spelling of 78142780 in words is "seventy-eight million, one hundred forty-two thousand, seven hundred eighty".