78378012 has 18 divisors (see below), whose sum is σ = 198122288. Its totient is φ = 26125992.

The previous prime is 78377993. The next prime is 78378031. The reversal of 78378012 is 21087387.

It is an interprime number because it is at equal distance from previous prime (78377993) and next prime (78378031).

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×78378012² = 12286225530144288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2177167 = 78378012 / (7 + 8 + 3 + 7 + 8 + 0 + 1 + 2).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1088548 + ... + 1088619.

Almost surely, 2^78378012 is an apocalyptic number.

It is an amenable number.

78378012 is an abundant number, since it is smaller than the sum of its proper divisors (119744276).

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

78378012 is a wasteful number, since it uses less digits than its factorization.

78378012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2177177 (or 2177172 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 78378012 is about 8853.1357156659. The cubic root of 78378012 is about 427.9549767762.

The spelling of 78378012 in words is "seventy-eight million, three hundred seventy-eight thousand, twelve".