78555001 has 16 divisors (see below), whose sum is σ = 92542464. Its totient is φ = 65286144.

The previous prime is 78554999. The next prime is 78555017. The reversal of 78555001 is 10055587.

It is not a de Polignac number, because 78555001 - 2¹ = 78554999 is a prime.

It is a super-2 number, since 2×78555001² = 12341776364220002, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78555031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36121 + ... + 38233.

It is an arithmetic number, because the mean of its divisors is an integer number (5783904).

Almost surely, 2^78555001 is an apocalyptic number.

It is an amenable number.

78555001 is a deficient number, since it is larger than the sum of its proper divisors (13987463).

78555001 is a wasteful number, since it uses less digits than its factorization.

78555001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280.

The product of its (nonzero) digits is 7000, while the sum is 31.

The square root of 78555001 is about 8863.1259158380. The cubic root of 78555001 is about 428.2768628924.

The spelling of 78555001 in words is "seventy-eight million, five hundred fifty-five thousand, one".