78401662 has 4 divisors (see below), whose sum is σ = 117602496. Its totient is φ = 39200830.

The previous prime is 78401627. The next prime is 78401693. The reversal of 78401662 is 26610487.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×78401662² = 12293641208724488, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19600414 + ... + 19600417.

It is an arithmetic number, because the mean of its divisors is an integer number (29400624).

Almost surely, 2^78401662 is an apocalyptic number.

78401662 is a deficient number, since it is larger than the sum of its proper divisors (39200834).

78401662 is a wasteful number, since it uses less digits than its factorization.

78401662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39200833.

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 78401662 is about 8854.4712998575. The cubic root of 78401662 is about 427.9980165570.

The spelling of 78401662 in words is "seventy-eight million, four hundred one thousand, six hundred sixty-two".