78378377 has 16 divisors (see below), whose sum is σ = 98150400. Its totient is φ = 60804240.

The previous prime is 78378353. The next prime is 78378397. The reversal of 78378377 is 77387387.

It is not a de Polignac number, because 78378377 - 2¹² = 78374281 is a prime.

It is a super-2 number, since 2×78378377² = 12286339962308258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78378317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16274 + ... + 20532.

It is an arithmetic number, because the mean of its divisors is an integer number (6134400).

Almost surely, 2^78378377 is an apocalyptic number.

78378377 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

78378377 is a deficient number, since it is larger than the sum of its proper divisors (19772023).

78378377 is a wasteful number, since it uses less digits than its factorization.

78378377 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4516.

The product of its digits is 1382976, while the sum is 50.

The square root of 78378377 is about 8853.1563298069. The cubic root of 78378377 is about 427.9556410923.

The spelling of 78378377 in words is "seventy-eight million, three hundred seventy-eight thousand, three hundred seventy-seven".