71977851 has 12 divisors (see below), whose sum is σ = 113419800. Its totient is φ = 43622880.

The previous prime is 71977811. The next prime is 71977853. The reversal of 71977851 is 15877917.

It is a happy number.

It is not a de Polignac number, because 71977851 - 2¹¹ = 71975803 is a prime.

It is a super-2 number, since 2×71977851² = 10361622069156402, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 71977797 and 71977806.

It is not an unprimeable number, because it can be changed into a prime (71977853) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 363426 + ... + 363623.

It is an arithmetic number, because the mean of its divisors is an integer number (9451650).

Almost surely, 2^71977851 is an apocalyptic number.

71977851 is a deficient number, since it is larger than the sum of its proper divisors (41441949).

71977851 is a wasteful number, since it uses less digits than its factorization.

71977851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727066 (or 727063 counting only the distinct ones).

The product of its digits is 123480, while the sum is 45.

The square root of 71977851 is about 8483.9761315082. The cubic root of 71977851 is about 415.9741011829.

The spelling of 71977851 in words is "seventy-one million, nine hundred seventy-seven thousand, eight hundred fifty-one".