91961276240 has 20 divisors (see below), whose sum is σ = 213809967444. Its totient is φ = 36784510464.

The previous prime is 91961276227. The next prime is 91961276243. The reversal of 91961276240 is 4267216919.

It can be written as a sum of positive squares in 2 ways, for example, as 60541586704 + 31419689536 = 246052^2 + 177256^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-3 number, since 3×91961276240³ (a number of 34 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91961276243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 574757897 + ... + 574758056.

Almost surely, 2^91961276240 is an apocalyptic number.

It is an amenable number.

91961276240 is an abundant number, since it is smaller than the sum of its proper divisors (121848691204).

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

91961276240 is a wasteful number, since it uses less digits than its factorization.

91961276240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1149515966 (or 1149515960 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 47.

The spelling of 91961276240 in words is "ninety-one billion, nine hundred sixty-one million, two hundred seventy-six thousand, two hundred forty".