78378501392 has 10 divisors (see below), whose sum is σ = 151858346478. Its totient is φ = 39189250688.

The previous prime is 78378501371. The next prime is 78378501407. The reversal of 78378501392 is 29310587387.

It can be written as a sum of positive squares in only one way, i.e., 72600069136 + 5778432256 = 269444^2 + 76016^2 .

It is a super-2 number, since 2×78378501392² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2449328153 + ... + 2449328184.

Almost surely, 2^78378501392 is an apocalyptic number.

It is an amenable number.

78378501392 is a deficient number, since it is larger than the sum of its proper divisors (73479845086).

78378501392 is a wasteful number, since it uses less digits than its factorization.

78378501392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4898656345 (or 4898656339 counting only the distinct ones).

The product of its (nonzero) digits is 2540160, while the sum is 53.

The spelling of 78378501392 in words is "seventy-eight billion, three hundred seventy-eight million, five hundred one thousand, three hundred ninety-two".