78119720 has 48 divisors (see below), whose sum is σ = 204471540. Its totient is φ = 26783232.

The previous prime is 78119689. The next prime is 78119749. The reversal of 78119720 is 2791187.

It can be written as a sum of positive squares in 2 ways, for example, as 73650724 + 4468996 = 8582^2 + 2114^2 .

It is a super-2 number, since 2×78119720² = 12205381305756800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17969 + ... + 21888.

Almost surely, 2^78119720 is an apocalyptic number.

78119720 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78119720 is an abundant number, since it is smaller than the sum of its proper divisors (126351820).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78119720 is a wasteful number, since it uses less digits than its factorization.

78119720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39882 (or 39871 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 35.

The square root of 78119720 is about 8838.5360778808. The cubic root of 78119720 is about 427.4843558677.

The spelling of 78119720 in words is "seventy-eight million, one hundred nineteen thousand, seven hundred twenty".