78878137 has 16 divisors (see below), whose sum is σ = 88115328. Its totient is φ = 70139520.

The previous prime is 78878131. The next prime is 78878141. The reversal of 78878137 is 73187887.

It is a de Polignac number, because none of the positive numbers 2^k-78878137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78878131) 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, 43348 + ... + 45130.

It is an arithmetic number, because the mean of its divisors is an integer number (5507208).

Almost surely, 2^78878137 is an apocalyptic number.

It is an amenable number.

78878137 is a deficient number, since it is larger than the sum of its proper divisors (9237191).

78878137 is a wasteful number, since it uses less digits than its factorization.

78878137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920.

The product of its digits is 526848, while the sum is 49.

The square root of 78878137 is about 8881.3364422253. The cubic root of 78878137 is about 428.8632984896.

The spelling of 78878137 in words is "seventy-eight million, eight hundred seventy-eight thousand, one hundred thirty-seven".