78332551 has 4 divisors (see below), whose sum is σ = 85453704. Its totient is φ = 71211400.

The previous prime is 78332533. The next prime is 78332557. The reversal of 78332551 is 15523387.

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

It is a cyclic number.

It is not a de Polignac number, because 78332551 - 2¹³ = 78324359 is a prime.

It is a super-2 number, since 2×78332551² = 12271977092335202, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78332557) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3560560 + ... + 3560581.

It is an arithmetic number, because the mean of its divisors is an integer number (21363426).

Almost surely, 2^78332551 is an apocalyptic number.

78332551 is a deficient number, since it is larger than the sum of its proper divisors (7121153).

78332551 is a wasteful number, since it uses less digits than its factorization.

78332551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7121152.

The product of its digits is 25200, while the sum is 34.

The square root of 78332551 is about 8850.5678348906. The cubic root of 78332551 is about 427.8722196210.

The spelling of 78332551 in words is "seventy-eight million, three hundred thirty-two thousand, five hundred fifty-one".