71990457 has 36 divisors (see below), whose sum is σ = 122389488. Its totient is φ = 37220400.

The previous prime is 71990447. The next prime is 71990473. The reversal of 71990457 is 75409917.

It is a happy number.

It is not a de Polignac number, because 71990457 - 2¹⁰ = 71989433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (71990407) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 341082 + ... + 341292.

It is an arithmetic number, because the mean of its divisors is an integer number (3399708).

Almost surely, 2^71990457 is an apocalyptic number.

71990457 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

71990457 is a deficient number, since it is larger than the sum of its proper divisors (50399031).

71990457 is a wasteful number, since it uses less digits than its factorization.

71990457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450 (or 232 counting only the distinct ones).

The product of its (nonzero) digits is 79380, while the sum is 42.

The square root of 71990457 is about 8484.7190289367. The cubic root of 71990457 is about 415.9983839465.

It can be divided in two parts, 71 and 990457, that added together give a triangular number (990528 = T₁₄₀₇).

The spelling of 71990457 in words is "seventy-one million, nine hundred ninety thousand, four hundred fifty-seven".