71400657 has 8 divisors (see below), whose sum is σ = 98272000. Its totient is φ = 46064880.

The previous prime is 71400631. The next prime is 71400677. The reversal of 71400657 is 75600417.

It is a happy number.

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

It is not a de Polignac number, because 71400657 - 2⁷ = 71400529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71400607) 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, 383782 + ... + 383967.

It is an arithmetic number, because the mean of its divisors is an integer number (12284000).

Almost surely, 2^71400657 is an apocalyptic number.

It is an amenable number.

71400657 is a deficient number, since it is larger than the sum of its proper divisors (26871343).

71400657 is a wasteful number, since it uses less digits than its factorization.

71400657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767783.

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 71400657 is about 8449.8909460418. The cubic root of 71400657 is about 414.8592099959.

The spelling of 71400657 in words is "seventy-one million, four hundred thousand, six hundred fifty-seven".