78402716 has 24 divisors (see below), whose sum is σ = 157691520. Its totient is φ = 33411312.

The previous prime is 78402697. The next prime is 78402743. The reversal of 78402716 is 61720487.

It is a happy number.

It is a super-2 number, since 2×78402716² = 12293971752353312, 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 7 ways as a sum of consecutive naturals, for example, 2810 + ... + 12833.

It is an arithmetic number, because the mean of its divisors is an integer number (6570480).

Almost surely, 2^78402716 is an apocalyptic number.

It is an amenable number.

78402716 is an abundant number, since it is smaller than the sum of its proper divisors (79288804).

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

78402716 is a wasteful number, since it uses less digits than its factorization.

78402716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15833 (or 15831 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 78402716 is about 8854.5308176097. The cubic root of 78402716 is about 427.9999344921. Note that the first 4 decimals are identical.

The spelling of 78402716 in words is "seventy-eight million, four hundred two thousand, seven hundred sixteen".