78361621 has 8 divisors (see below), whose sum is σ = 88058880. Its totient is φ = 69188592.

The previous prime is 78361607. The next prime is 78361651. The reversal of 78361621 is 12616387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78361621 is a prime.

It is a super-2 number, since 2×78361621² = 12281087291495282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78361651) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 130741 + ... + 131338.

It is an arithmetic number, because the mean of its divisors is an integer number (11007360).

Almost surely, 2^78361621 is an apocalyptic number.

It is an amenable number.

78361621 is a deficient number, since it is larger than the sum of its proper divisors (9697259).

78361621 is a wasteful number, since it uses less digits than its factorization.

78361621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262115.

The product of its digits is 12096, while the sum is 34.

The square root of 78361621 is about 8852.2099500633. The cubic root of 78361621 is about 427.9251423074.

The spelling of 78361621 in words is "seventy-eight million, three hundred sixty-one thousand, six hundred twenty-one".