78140190 has 64 divisors (see below), whose sum is σ = 192741120. Its totient is φ = 20267520.

The previous prime is 78140147. The next prime is 78140197. The reversal of 78140190 is 9104187.

It is a super-2 number, since 2×78140190² = 12211778586472200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78140197) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 231702 + ... + 232038.

It is an arithmetic number, because the mean of its divisors is an integer number (3011580).

Almost surely, 2^78140190 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78140190, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96370560).

78140190 is an abundant number, since it is smaller than the sum of its proper divisors (114600930).

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

78140190 is a wasteful number, since it uses less digits than its factorization.

78140190 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 537.

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 78140190 is about 8839.6939992287. The cubic root of 78140190 is about 427.5216910440.

The spelling of 78140190 in words is "seventy-eight million, one hundred forty thousand, one hundred ninety".