71961510 has 32 divisors (see below), whose sum is σ = 182868192. Its totient is φ = 18060800.

The previous prime is 71961481. The next prime is 71961511. The reversal of 71961510 is 1516917.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71961511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 70041 + ... + 71060.

It is an arithmetic number, because the mean of its divisors is an integer number (5714631).

Almost surely, 2^71961510 is an apocalyptic number.

71961510 is an abundant number, since it is smaller than the sum of its proper divisors (110906682).

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

71961510 is a wasteful number, since it uses less digits than its factorization.

71961510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141128.

The product of its (nonzero) digits is 1890, while the sum is 30.

The square root of 71961510 is about 8483.0130260421. The cubic root of 71961510 is about 415.9426195203.

The spelling of 71961510 in words is "seventy-one million, nine hundred sixty-one thousand, five hundred ten".