78401016 has 24 divisors (see below), whose sum is σ = 212336280. Its totient is φ = 26133648.

The previous prime is 78401009. The next prime is 78401021. The reversal of 78401016 is 61010487.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×78401016² = 12293438619664512, 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 5 ways as a sum of consecutive naturals, for example, 544380 + ... + 544523.

It is an arithmetic number, because the mean of its divisors is an integer number (8847345).

Almost surely, 2^78401016 is an apocalyptic number.

It is an amenable number.

78401016 is an abundant number, since it is smaller than the sum of its proper divisors (133935264).

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

78401016 is a wasteful number, since it uses less digits than its factorization.

78401016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1088915 (or 1088908 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 78401016 is about 8854.4348210374. The cubic root of 78401016 is about 427.9968410400.

The spelling of 78401016 in words is "seventy-eight million, four hundred one thousand, sixteen".