78146646 has 16 divisors (see below), whose sum is σ = 158435184. Its totient is φ = 25691904.

The previous prime is 78146633. The next prime is 78146657. The reversal of 78146646 is 64664187.

It is a super-2 number, since 2×78146646² = 12213796562098632, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78146598 and 78146607.

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, 88771 + ... + 89646.

It is an arithmetic number, because the mean of its divisors is an integer number (9902199).

Almost surely, 2^78146646 is an apocalyptic number.

78146646 is an abundant number, since it is smaller than the sum of its proper divisors (80288538).

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

78146646 is a wasteful number, since it uses less digits than its factorization.

78146646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178495.

The product of its digits is 193536, while the sum is 42.

The square root of 78146646 is about 8840.0591626980. The cubic root of 78146646 is about 427.5334647720.

The spelling of 78146646 in words is "seventy-eight million, one hundred forty-six thousand, six hundred forty-six".