71490240 has 168 divisors, whose sum is σ = 249314208. Its totient is φ = 18800640.

The previous prime is 71490239. The next prime is 71490257. The reversal of 71490240 is 4209417.

71490240 = T₂₄₈ + T₂₄₉ + ... + T₇₆₂.

It is a happy number.

It is a super-2 number, since 2×71490240² = 10221708830515200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 296520 + ... + 296760.

Almost surely, 2^71490240 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71490240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (124657104).

71490240 is an abundant number, since it is smaller than the sum of its proper divisors (177823968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71490240 is a wasteful number, since it uses less digits than its factorization.

71490240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367 (or 354 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 71490240 is about 8455.1901220493. The cubic root of 71490240 is about 415.0326388420.

Adding to 71490240 its reverse (4209417), we get a palindrome (75699657).

The spelling of 71490240 in words is "seventy-one million, four hundred ninety thousand, two hundred forty".