78001831 has 8 divisors (see below), whose sum is σ = 83008800. Its totient is φ = 73041408.

The previous prime is 78001787. The next prime is 78001837. The reversal of 78001831 is 13810087.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 78001831 - 2¹³ = 77993639 is a prime.

It is a super-2 number, since 2×78001831² = 12168571278705122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78001831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78001837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8146 + ... + 14911.

It is an arithmetic number, because the mean of its divisors is an integer number (10376100).

Almost surely, 2^78001831 is an apocalyptic number.

78001831 is a deficient number, since it is larger than the sum of its proper divisors (5006969).

78001831 is a wasteful number, since it uses less digits than its factorization.

78001831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23273.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 78001831 is about 8831.8645256820. The cubic root of 78001831 is about 427.2692114078.

The spelling of 78001831 in words is "seventy-eight million, one thousand, eight hundred thirty-one".