37997744640 has 160 divisors (see below), whose sum is σ = 124300097856. Its totient is φ = 9897000960.

The previous prime is 37997744623. The next prime is 37997744641. The reversal of 37997744640 is 4644779973.

It is a tau number, because it is divible by the number of its divisors (160).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is not an unprimeable number, because it can be changed into a prime (37997744641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 272710 + ... + 387770.

Almost surely, 2^37997744640 is an apocalyptic number.

37997744640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 37997744640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62150048928).

37997744640 is an abundant number, since it is smaller than the sum of its proper divisors (86302353216).

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

37997744640 is a wasteful number, since it uses less digits than its factorization.

37997744640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115130 (or 115114 counting only the distinct ones).

The product of its (nonzero) digits is 32006016, while the sum is 60.

The spelling of 37997744640 in words is "thirty-seven billion, nine hundred ninety-seven million, seven hundred forty-four thousand, six hundred forty".