78351801 has 24 divisors (see below), whose sum is σ = 120298464. Its totient is φ = 44979840.

The previous prime is 78351797. The next prime is 78351809. The reversal of 78351801 is 10815387.

It is not a de Polignac number, because 78351801 - 2² = 78351797 is a prime.

It is a super-2 number, since 2×78351801² = 12278009439887202, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (78351809) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8625 + ... + 15201.

It is an arithmetic number, because the mean of its divisors is an integer number (5012436).

Almost surely, 2^78351801 is an apocalyptic number.

It is an amenable number.

78351801 is a deficient number, since it is larger than the sum of its proper divisors (41946663).

78351801 is a wasteful number, since it uses less digits than its factorization.

78351801 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6629 (or 6610 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 78351801 is about 8851.6552689313. The cubic root of 78351801 is about 427.9072662077.

The spelling of 78351801 in words is "seventy-eight million, three hundred fifty-one thousand, eight hundred one".