78345778 has 32 divisors (see below), whose sum is σ = 141978240. Its totient is φ = 31674240.

The previous prime is 78345763. The next prime is 78345781. The reversal of 78345778 is 87754387.

It is a super-2 number, since 2×78345778² = 12276121860850568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82788 + ... + 83728.

It is an arithmetic number, because the mean of its divisors is an integer number (4436820).

Almost surely, 2^78345778 is an apocalyptic number.

78345778 is a deficient number, since it is larger than the sum of its proper divisors (63632462).

78345778 is a wasteful number, since it uses less digits than its factorization.

78345778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1282.

The product of its digits is 1317120, while the sum is 49.

The square root of 78345778 is about 8851.3150435401. The cubic root of 78345778 is about 427.8963013395.

The spelling of 78345778 in words is "seventy-eight million, three hundred forty-five thousand, seven hundred seventy-eight".