78019157 has 16 divisors (see below), whose sum is σ = 83331072. Its totient is φ = 72923760.

The previous prime is 78019153. The next prime is 78019159. The reversal of 78019157 is 75191087.

It is a cyclic number.

It is not a de Polignac number, because 78019157 - 2² = 78019153 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78019157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78019153) 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, 142358 + ... + 142904.

It is an arithmetic number, because the mean of its divisors is an integer number (5208192).

Almost surely, 2^78019157 is an apocalyptic number.

It is an amenable number.

78019157 is a deficient number, since it is larger than the sum of its proper divisors (5311915).

78019157 is a wasteful number, since it uses less digits than its factorization.

78019157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728.

The product of its (nonzero) digits is 17640, while the sum is 38.

The square root of 78019157 is about 8832.8453513010. The cubic root of 78019157 is about 427.3008445041.

The spelling of 78019157 in words is "seventy-eight million, nineteen thousand, one hundred fifty-seven".