78261756 has 12 divisors (see below), whose sum is σ = 182610792. Its totient is φ = 26087248.

The previous prime is 78261737. The next prime is 78261791. The reversal of 78261756 is 65716287.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×78261756² = 12249804904407072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3260895 + ... + 3260918.

It is an arithmetic number, because the mean of its divisors is an integer number (15217566).

Almost surely, 2^78261756 is an apocalyptic number.

It is an amenable number.

78261756 is an abundant number, since it is smaller than the sum of its proper divisors (104349036).

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

78261756 is a wasteful number, since it uses less digits than its factorization.

78261756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6521820 (or 6521818 counting only the distinct ones).

The product of its digits is 141120, while the sum is 42.

The square root of 78261756 is about 8846.5674699287. The cubic root of 78261756 is about 427.7432806998.

The spelling of 78261756 in words is "seventy-eight million, two hundred sixty-one thousand, seven hundred fifty-six".